Geography

Ocean Salinity Ocean Salinity for Geography Optional: Comparative Themes and Analysis Ocean salinity for Geography Optional and UPSC: comparing the three oceans, temperature and salinity, why cyclones cluster, and a full synthesis of the salinity story. Jun 202620 min read Ocean Salinity Impacts of Ocean Salinity: Economic, Environmental and Human Effects Impacts of ocean salinity for UPSC: desalination, salt and minerals from the sea, ocean resources, marine pollution, the brine problem, and the sustainable blue economy. Jun 202620 min read Ocean Salinity Water Masses of the Ocean: Formation, Oceanographic Processes and Salinity Fronts Water masses of the ocean for UPSC: water masses and the T-S diagram, the thermal structure, sea surface temperature and cyclones, double diffusion, and salinity fronts. Jun 202620 min read Ocean Salinity Salinity of the Indian Ocean: Arabian Sea, Bay of Bengal and the Indian Context Salinity of the Indian Ocean for UPSC: the Indian Ocean's monsoon drift, the salty Arabian Sea, the fresh Bay of Bengal, water masses, observation, and India's… Jun 202620 min read Ocean Salinity Estuaries and Marine Ecosystems: Salinity Gradients and Salinity Stress Estuaries and marine ecosystems for UPSC: osmoregulation, coral and mangrove salinity tolerance, estuary types and productivity, red tides, and spreading dead zones. Jun 202621 min read Ocean Salinity Indian Ocean Dipole, El Nino, Monsoon and Ocean Salinity in Climate Indian Ocean Dipole explained with El Nino, La Nina and the Walker circulation, and how salinity, the barrier layer and warming shape the monsoon. Jun 202619 min read Cyclones Cyclones and Climate Change Cyclones and climate change for UPSC: warming seas, stronger and wetter storms, rapid intensification, the Arabian Sea shift, and what it means for India. Jun 20265 min read Cyclones Cyclone Forecasting and Disaster Management Cyclone forecasting and disaster management in India for UPSC: IMD as RSMC, satellites and Doppler radar, the four-stage warning, NDMA, NDRF and the NCRMP. Jun 20267 min read Ocean Salinity Thermohaline Circulation: Thermocline, Halocline and AMOC Thermohaline circulation explained: how temperature and salinity drive deep ocean currents, with the thermocline, halocline, conveyor belt and AMOC. May 202622 min read Ocean Salinity Salinity of Ocean Water: Sources, Factors and Distribution Salinity of ocean water for UPSC: the average of 35 parts per thousand, the main source of sea salt, factors affecting salinity and its distribution. May 202619 min read Mid-Ocean Ridge: Formation, Features, Examples and Sea-Floor Spreading Mid-ocean ridge for UPSC: how the 65,000 km undersea mountain chain forms, its rift valley and flank zone, the Mid-Atlantic Ridge and sea-floor spreading. May 202621 min read Cyclones List of Cyclones in Odisha from 1999 to 2024 and Major Cyclones in India List of cyclones in Odisha from 1999 to 2024 with wind speed and deaths, and major cyclones in India: the 1999 super cyclone, Phailin, Fani, Amphan,… May 202620 min read Cyclones Cyclone Impacts on India: Storm Surge and Coastal Vulnerability Cyclone impacts for UPSC: storm surge, coastal erosion, mangrove loss, agriculture and livelihood damage, and India's coastal-state vulnerability profile. May 202613 min read Cyclones Cyclone-Monsoon Interaction: May and November Peaks Indian Ocean cyclones peak in May and November because the monsoon's vertical wind shear suppresses June-to-September storms across the climate calendar. May 202614 min read Cyclones Western Disturbances over India: Winter Rain and Snow Western Disturbances for UPSC: Mediterranean storms in the subtropical westerly jet bringing winter rain, Himalayan snow and Rabi-crop moisture to North India. May 202613 min read Cyclones Temperate Cyclone Formation, Stages and Polar Front Theory Temperate cyclone explained: how extratropical cyclones form on the polar front, their stages and fronts, bomb cyclones and western disturbances in India. May 202621 min read Cyclones Stages of a Tropical Cyclone: Life Cycle from Disturbance to Dissipation Tropical cyclone life cycle for UPSC: five stages from disturbance to dissipation, Dvorak T-numbers, IMD intensity tiers, and the three decay pathways. May 202612 min read Cyclones Tropical Cyclogenesis: How Tropical Cyclones Form, Mechanism and Conditions Tropical cyclogenesis for UPSC: the six conditions, seed disturbances, the WISHE feedback engine, warm-core growth, and the Genesis Potential Index. May 202615 min read Cyclones Bay of Bengal and Arabian Sea Cyclones, Global Distribution and Basins Bay of Bengal and Arabian Sea cyclones: why the Bay has more, which is more dangerous, the global distribution of tropical cyclones and landfall in India. May 202613 min read Cyclones Cyclone Classification, Naming and Tracking Cyclone classification for UPSC: IMD seven-tier wind-speed scale, Saffir-Simpson cross-reference, thirteen-nation naming panel, and RSMC New Delhi tracking. May 202615 min read Cyclones Tropical Cyclone Meaning, Formation and Structure What is a tropical cyclone? How cyclones are formed over warm seas, the six conditions, and the eye, eyewall and rainbands, with diagrams and PYQs. May 202621 min read Indian Drainage System Indian Rivers: Floods, Pollution, Conservation and Climate Change Indian rivers explained for UPSC: floods, river pollution, the Namami Gange programme, conservation, and how climate change reshapes glacier-fed flows. May 202617 min read Indian Drainage System River Linking and Inter-State Water Disputes River linking and inter-state water disputes for UPSC: how Indian rivers drive irrigation, hydropower, the NRLP 30 links, and six dispute tribunals. May 202614 min read Indian Drainage System River Landforms: Erosional and Depositional Features, Deltas and Estuaries Erosional and depositional river landforms for UPSC: gorges, waterfalls, alluvial fans, meanders, oxbow lakes, deltas and estuaries, with Indian examples. May 202613 min read Indian Drainage System West Flowing Rivers of India: Narmada, Tapti, Luni and Inland Drainage West flowing rivers of India for UPSC: why the Narmada and Tapti run west through rift valleys and form estuaries, and why the Luni ends in… May 202615 min read Indian Drainage System Kaveri River and Krishna River: Tributaries, Dams and the Cauvery Water Dispute Kaveri river and Krishna river explained: origin, course, tributaries, dams and falls, and the Cauvery and Krishna water disputes and tribunals. May 202610 min read Indian Drainage System East-Flowing Peninsular Rivers: Godavari, Mahanadi East-flowing Peninsular rivers for UPSC: the Mahanadi from Sihawa to Hirakud, and the Godavari, the Dakshina Ganga and second-longest Indian river. May 202614 min read Indian Drainage System Brahmaputra River: Tsangpo, Braiding, Assam Floods Brahmaputra river for UPSC: how the Yarlung Tsangpo becomes the Brahmaputra at Sadiya, the braided Assam floods, Majuli island, tributaries and the Barak. May 202615 min read Indian Drainage System Ganga Delta and Sundarbans: Geomorphology and Cultural Significance Ganga delta geomorphology for UPSC: meanders and oxbows on the Indo-Gangetic plain, the world's largest delta, the Sundarbans, and the Farakka split. May 202616 min read Indian Drainage System Ganga River: Origin, Tributaries, Yamuna and the Ganga Basin Ganga river explained: origin at Gangotri and the Panch Prayag, left and right bank tributaries, the Yamuna, Kosi and Son, and the Ganga basin. May 202613 min read Indian Drainage System Indus River System and Indus Waters Treaty (1960) Indus River System for UPSC: the main Indus, the five Punjab tributaries (Jhelum, Chenab, Ravi, Beas, Sutlej), and the 1960 Indus Waters Treaty split. May 202616 min read Indian Drainage System Himalayan River System: Characteristics and Features Himalayan rivers explained for UPSC: perennial snow, glacier and monsoon flow, antecedent gorges, Bhabhar to Khadar belts, braided and meandering channels. May 202617 min read Indian Drainage System Antecedent and Superimposed Drainage in India Antecedent and superimposed drainage in India for UPSC: why the Indus and Brahmaputra cut the Himalaya, the Damodar and Chambal examples, and river capture. May 202616 min read Indian Drainage System Factors Controlling Drainage Patterns Factors that control drainage patterns explained for UPSC: how geology, relief, rock type, tectonics and rainfall shape Indian rivers like the Damodar. May 202612 min read Indian Drainage System Types of Drainage Patterns with Examples Types of drainage patterns explained: dendritic, trellis, radial, centripetal, rectangular, parallel, annular and deranged, with Indian examples and PYQs. May 202620 min read Indian Drainage System Drainage System of India: River Basins, Himalayan and Peninsular Rivers Drainage system of India explained for UPSC: what a river basin, catchment and watershed mean, and how Himalayan, Peninsular and inland rivers differ. May 202611 min read Green Revolution Farmer Producer Organisations (FPOs) and Agricultural Policy in India Farmer producer organisations (FPOs) for UPSC: GR 2.0 policy architecture and FPO vehicle via the 10,000 FPO Scheme 2020, NMSA, PM-KUSUM, NFSM, PMFBY and KCC. May 202614 min read Green Revolution Precision, Digital and Biofortified Agriculture Precision and digital agriculture for UPSC: precision farming, AgriStack digital agriculture, and biofortified crops like Golden Rice and Dhanashakti pearl millet. May 202614 min read Green Revolution Climate-Smart Agriculture in India: NICRA and the FAO Pillars Climate-Smart Agriculture for UPSC: FAO three pillars, NICRA by ICAR-CRIDA, climate-resilient varieties, CCAFS, GACSA, and India's monsoon adaptation. May 202613 min read Green Revolution Natural and Organic Farming in India: ZBNF, PKVY and Sustainable Agriculture Sustainable agriculture for UPSC: conservation farming, NPOP organic under APEDA, PKVY, and natural-farming models SPNF, BPKP and APCNF. May 202614 min read Green Revolution Green Revolution 2.0: Meaning, Need and Features Green Revolution 2.0 for UPSC: productivity-to-sustainability pivot, four drivers, GR 1.0 vs 2.0 comparison, six objectives, and the Evergreen Revolution. May 202612 min read Green Revolution Negative Impact of the Green Revolution: Social, Economic and Environmental Effects Negative impact of the Green Revolution for UPSC: socio-economic and environmental critique of GR 1.0, groundwater depletion, stubble burning, and the bridge to GR 2.0. May 202614 min read Green Revolution Impact of the Green Revolution in India: Institutions and Regional Effects Impact of the Green Revolution in India for UPSC: FCI, CACP/MSP and NABARD credit; why the Punjab-Haryana wheat belt led while eastern India and dryland regions… May 202614 min read Green Revolution Green Revolution Technological Package Green Revolution technological package for UPSC: HYV seeds, fertilisers, irrigation, mechanisation, and credit as one integrated farm input system in India. May 202610 min read Green Revolution Origins of the Green Revolution: Norman Borlaug, M. S. Swaminathan and HYV Seeds Origins of the Green Revolution for UPSC: Borlaug's CIMMYT dwarf wheat, IRRI's IR8 rice, Swaminathan's IARI adaptation, and India's 1966 HYV Programme launch. May 202610 min read Green Revolution Indian Agriculture Before the Green Revolution: Famines, PL-480 and the Food Crisis Indian agriculture before the Green Revolution for UPSC: India's pre-1966 food crisis, the Bengal famine, PL-480 wheat imports, the Bihar drought, and the seed-fertiliser pivot. May 202611 min read Indian Agriculture Colour Revolutions in Indian Agriculture, Rural Economy and Farming Models Indian agriculture colour revolutions for UPSC: Green, White, Blue, Yellow plus NABARD rural credit, agrarian distress, FPOs and contemporary farm models. May 202610 min read Indian Agriculture Dryland Farming in India: Meaning and Examples Dryland farming and sustainable agriculture for UPSC: rainfed crops, ICAR-CRIDA, NMSA, NICRA 2011, NPOP organic farming, Sikkim, ZBNF and climate change. May 202610 min read Indian Agriculture Agricultural Marketing in India: APMC, Land Reforms and Farm Policies Agricultural marketing in India for UPSC: APMC mandis, MSP regime, CACP, FCI procurement, land reforms from zamindari abolition to land ceiling, plus PM-KISAN. May 202611 min read Indian Agriculture Indian Agriculture: Inputs, Technology and Productivity Indian agriculture inputs for UPSC: HYV seeds, SRR, NPK 4:2:1 imbalance, Soil Health Card 2015, Kisan Credit Card 1998, and the per-hectare yield gap. May 202611 min read Indian Agriculture Irrigation in India: Sources, PMKSY, Problems Irrigation in India for UPSC: canal, tube-well (largest, ~65%), tank sources; PMKSY 2015 four components; groundwater depletion, waterlogging and disputes. May 202611 min read Indian Agriculture Horticulture, Livestock and Fisheries in India Horticulture, livestock and fisheries for UPSC: India allied agricultural sectors, MIDH, 20th Livestock Census, DAHD, PMMSY, NFDB and the Blue Revolution. May 202612 min read Indian Agriculture Plantation Crops in India: Tea, Coffee, Rubber Plantation crops for UPSC: tea (Assam), coffee (Karnataka, Arabica vs Robusta), rubber (Kerala) and their statutory Tea, Coffee and Rubber Boards explained. May 202612 min read Indian Agriculture Commercial Crops in India: Cotton, Sugarcane, Jute Cotton, sugarcane, oilseeds, and jute for UPSC: black-soil cotton, sugarcane FRP, Yellow Revolution oilseeds, and jute, the golden fibre of the delta. May 202610 min read Indian Agriculture Millets and Pulses in India: Crops and States Millets and pulses for UPSC: jowar, bajra, ragi and gram, tur as dryland nutri-cereals and protein crops; covers IYM 2023, Shri Anna and NFSM Pulses. May 202610 min read Indian Agriculture Rice and Wheat in India: Cultivation, States, MSP Rice and wheat for UPSC: kharif rice (monsoon-fed eastern belt) and rabi wheat (Indo-Gangetic Wheat Belt), Green Revolution gains, and MSP-FCI procurement. May 202610 min read Indian Agriculture Cropping Seasons in India: Kharif, Rabi, Zaid and Agricultural Regions Cropping seasons in India for UPSC: agro-climatic regions, the three cropping seasons (Kharif, Rabi, Zaid), farming systems, and cropping-pattern change. May 202610 min read Indian Agriculture Indian Agriculture: Land Use and Physical Factors Indian agriculture, land use and physical factors for UPSC: land-use categories, net sown area, cropping intensity and the relief, climate, soil, water determinants. May 202610 min read Indian Soils Soil Erosion in India: Types, Causes and Conservation Soil erosion and conservation in India for UPSC: sheet, rill, gully, wind and coastal erosion, the Chambal ravines, and the IWMP, NMSA and UNCCD policy. May 202611 min read Indian Soils Soil Fertility and Productivity in India Soil fertility vs productivity for UPSC: the NPK and micronutrient profile, pH and CEC, the soil-climate-crop link, and the Soil Health Card scheme. May 202612 min read Indian Soils Peaty Soil and Marshy Soil in India, Kari Soil of Kerala and Wetlands Peaty and marshy soil in India: how peaty soil forms, where it is found, why Kerala's Kari soil is acid, how Kuttanad farms it and how… May 202617 min read Indian Soils Saline and Alkaline Soils in India: Causes, Reclamation Saline and alkaline soils in India explained for UPSC: the salt-affected belt, Solonchak vs Solonetz, gypsum reclamation, and salt-tolerant crops. May 20269 min read Indian Soils Mountain Soil and Forest Soil in India: Features, States and Crops Mountain soil and forest soil in India: where they are found, their characteristics, colour and crops, and how forests prevent soil erosion on slopes. May 202617 min read Indian Soils Arid Soil in India (Desert Soil): Features, Formation, States and Crops Arid soil (desert soil) in India: where it is found, its features, kankar and salts, the crops it grows, the Indira Gandhi Canal and desertification. May 202617 min read Indian Soils Laterite Soil and Red Soil in India: Formation, Difference and Crops Laterite soil and red soil in India: how each forms, why they are red, the difference between them, the states where they occur and their crops. May 202615 min read Indian Soils Alluvial Soil in India: Khadar and Bhangar Difference, Features and Map Alluvial soil in India: the difference between khadar and bhangar, bhabar and terai, characteristics, crops, the delta soils of the east coast and a map. May 202614 min read Indian Soils Types of Soil in India: Formation and Classification Types of soil in India for UPSC: soil definition, the five soil-forming factors, profile horizons, and the ICAR-USDA classification of Indian soils. May 20268 min read Climate of India Koppen Climate Classification of India and Thornthwaite Koppen climate classification explained: the five groups and letter codes, India's eight climatic regions with a map, and Thornthwaite's moisture index. May 202622 min read Climate of India Distribution of Rainfall in India: Temperature, Pressure, Winds and Local Winds Distribution of rainfall in India for UPSC: rainfall belts, January 18C isotherm, monsoon trough, Horse Latitudes, and local winds Loo and Kalbaisakhi explained. May 202612 min read Climate of India Monsoon Variability in India: Floods, Droughts, Climate Change and Sector Impacts Climate of India for UPSC: monsoon variability, drought, flood, cyclone and heat wave hazards, the IPCC AR6 signal, and the NAPCC, NDC and Net Zero 2070… May 202615 min read Climate of India Seasons of India with Months (Winter, Summer, Monsoon, Retreating) Seasons of India with months: the cold weather, hot weather, south-west monsoon and retreating monsoon seasons, the six ritus and the weather of each. May 202617 min read Climate of India Theories of Monsoon: Onset, Burst, Break and Withdrawal of Monsoon Onset and withdrawal of monsoon in India with normal dates, the burst and break of the monsoon, and the thermal, dynamic and jet stream theories. May 202611 min read Climate of India Indian Monsoon: Pressure, Winds and Jet Streams Indian monsoon pressure, winds and jet streams for UPSC: pressure belts, ITCZ, monsoon trough, jet streams (STWJ, TEJ), ENSO, IOD, MJO teleconnections, Coriolis force. May 202616 min read Climate of India Climate of India: Factors That Control It Climate of India foundation for UPSC: tropical monsoon character, latitudinal factor (Tropic of Cancer), altitude (Himalayan barrier), distance from sea,. May 202617 min read Drainage Patterns of India: Geometry, Genesis, and River Systems A drainage pattern is the geometric arrangement formed by a river and its tributaries across a landscape, reflecting the underlying lithol May 202614 min read Western Disturbances and India’s Winter Weather Systems A Western Disturbance (WD) is an extratropical synoptic-scale low-pressure system that originates over the Mediterranean May 202612 min read Biodiversity Hotspots Biodiversity Conservation in India: In Situ and Ex Situ Methods, Laws and Conventions Biodiversity conservation explained: in situ and ex situ methods, biosphere reserves, the Wildlife and Biological Diversity Acts, CBD, Ramsar and CITES. May 202618 min read Biodiversity Hotspots Sundaland Hotspot in India, Nicobar Islands and Biogeographic Zones Sundaland hotspot in India: why only the Nicobar Islands belong to it, their wildlife, the Great Nicobar project and India's ten biogeographic zones. May 202622 min read Biodiversity Hotspots Gadgil and Kasturirangan Reports: Western Ghats ESZ Western Ghats threats and ESZ debate for UPSC: Gadgil 2011 vs Kasturirangan 2013, state-level pushback, Wayanad 2024 landslide, way forward. May 202612 min read Biodiversity Hotspots Western Ghats Biodiversity Hotspot Western Ghats Biodiversity Hotspot for UPSC: 1,600 km extent across 6 states, orographic monsoon, shola-grassland, lion-tailed macaque, UNESCO 2012. May 202612 min read Biodiversity Hotspots Indo-Burma Hotspot, the Indo-Burma Region and North-East India Indo-Burma hotspot explained: the Indo-Burma region, north-east India's share, its endemic plants and animals, protected areas and main threats. May 202612 min read Biodiversity Hotspots Himalayan Biodiversity Hotspot: Extent, Endemism, Threats Himalayan Biodiversity Hotspot for UPSC: Eastern and Western Himalaya extent, altitudinal zonation, endemic flora, snow leopard, and climate-change threats. May 202614 min read Biodiversity Hotspots Biodiversity Hotspots in India and the World Biodiversity hotspots in India and the world: meaning, criteria, the 36 hotspots, and India's four: Himalaya, Indo-Burma, Western Ghats and Sundaland. May 202618 min read Biodiversity Hotspots Biodiversity: Levels, India’s Status and BD Act 2002 Biodiversity for UPSC: four levels (genetic, species, ecosystem, functional), endemic and keystone species, India mega-diverse status, BD Act 2002. May 202612 min read Forest Types of India: Natural Vegetation, Champion and Seth Classification and Forest Cover Forest types of India explained: the five main forest types, where they grow, the Champion and Seth classification, mangroves, forest cover and policy. May 202612 min read Plate Tectonics: Continental Drift, Sea-Floor Spreading, Plate Boundaries, and Mantle Plumes Plate tectonics is the unifying theory of solid-earth geology that explains the present positions of continents, the distribution of earth May 202618 min read Indian Monsoon Indian Monsoon and Climate Change: Mission Mausam, Cloudbursts Indian monsoon and climate change for UPSC: IPCC AR6 climate-change projections, Mission Mausam 2024, cloudbursts mechanism, NDMA mitigation, PMFBY 2016, PMKSY, SASCOF. May 202616 min read Indian Monsoon Northeast Monsoon and Regional Variation of the Indian Monsoon Northeast monsoon and regional rainfall for UPSC: Western Ghats rainshadow, Northeast monsoon, Tamil Nadu winter rainfall, Bay of Bengal cyclones, IMD outlooks. May 202617 min read Indian Monsoon Mechanism of Monsoon: ITCZ, Jet Streams and Onset Indian monsoon mechanism explained: land and sea heating, the ITCZ and monsoon trough, Coriolis force, jet streams, onset dates, branches, ENSO and IOD. May 202624 min read Earthquakes Earthquake Disaster Management in India, NDMA Guidelines and Earthquake-Resistant Construction Earthquake disaster management in India: the DM Act 2005, NDMA guidelines and six pillars, earthquake-resistant construction, early warning and Sendai. May 202611 min read Earthquakes Seismic Zones of India: BIS IS 1893, Hazard Mapping and the Himalayan Gaps India's seismic zones explained: the BIS IS 1893 four-zone map, which regions fall in Zone V, the Himalayan seismic gaps, and how microzonation refines earthquake hazard… May 202614 min read Earthquakes How Earthquakes Occur: Mechanism, Plates and Seismic Waves Learn how earthquakes occur: fault rupture, elastic rebound, the three plate boundaries, P and S waves, and how Richter and moment magnitude differ. May 202618 min read Indian Soils Black Soil in India: Regur Soil, Formation, Characteristics, Crops and the Deccan Trap Black soil explained: why it is called regur or black cotton soil, how it forms on Deccan Trap basalt, its characteristics, states and main crops. May 20269 min read Soil Liquefaction: Mechanism, Conditions and Susceptibility Soil liquefaction is the phenomenon in which saturated, loose, granular soils, principally fine sands, silty sands, and young alluvium, lose nearly all of May 202621 min read ENSO ENSO Interactions, Global Impacts and Climate Change ENSO teleconnections for UPSC: how El Nino and La Nina shift the global Walker circulation, the Indian Ocean Dipole link, coral bleaching and IPCC AR6 trends. May 202622 min read ENSO Effect of El Nino in India on Monsoon, Farms and Economy Effect of El Nino in India: weaker monsoons and drought, La Nina rains, the IOD offset, the 2026 El Nino outlook and NDMA drought preparedness. May 202617 min read ENSO ENSO: Pacific Ocean-Atmosphere Coupling, El Niño-La Niña Cycle, Mechanism and Dynamics ENSO for UPSC: how Pacific trade winds, the Walker Circulation, Bjerknes feedback, and the Nino 3.4 SST index drive the El Nino and La Nina cycle. May 202619 min read Air Masses and Frontogenesis: Types of Air Masses, Fronts, Frontogenesis and Frontolysis Air masses explained: definition, source regions and types, air masses over India, the four types of fronts, and frontogenesis and frontolysis. May 202610 min read Glaciers of India: Major Glaciers, Rivers and Retreat Glaciers of India for UPSC: the Siachen and Gangotri glaciers, the rivers they feed, why they are India's water towers, and their retreat under climate change. May 20268 min read Global Warming: Meaning, Causes, Effects and Control Measures What is global warming: meaning, the greenhouse effect and gases, causes, effects on climate, seas and corals, and control measures from Kyoto to Paris. Dec 202520 min read Roman Geographers and Their Contributions: Strabo, Mela, Pliny and Ptolemy Roman geographers and their contributions to geography: Strabo's Geographica, Mela, Pliny, Ptolemy's Geography, Roman roads and maps, and India. Jan 202413 min read Fundamental Concepts of Geomorphology: Meaning, Processes and Landform Evolution Geomorphology meaning and scope, the fundamental concepts of geomorphology, endogenic and exogenic geomorphic processes, landslides and cycle of erosion. Nov 202314 min read Processes of Erosion: Corrasion, Corrosion, Attrition and Hydraulic Action Corrasion, corrosion, attrition and hydraulic action: how they differ, how rivers, glaciers, waves and wind erode, and coastal erosion in India. Nov 202312 min read Railway Zones in India: List of 18 Zones, Headquarters and Divisions Railway zones in India: the list of all 18 zones with headquarters and divisions, a zones map, the new South Coast Railway zone, and railway modernisation. Nov 202315 min read Types of Satellite Orbits: LEO, MEO, Geostationary, Polar and Sun-Synchronous Types of satellite orbits explained: LEO, MEO, geostationary, polar, sun-synchronous, transfer orbits and Lagrange points, with Indian examples. Dec 202018 min read Heat Budget of the Earth: Insolation, Albedo and Temperature Inversion Heat budget of the earth explained with a diagram: insolation, albedo, terrestrial radiation, the latitudinal balance, isotherms and temperature inversion. Apr 201919 min read Physical Geography Glossary: Key Terms A to Z A glossary of key physical geography terms for UPSC, arranged A to Z, covering landforms, climate, oceans, soils and more. Apr 201959 min read Pacific Ring of Fire: Location, Map, Volcanoes and Earthquakes Pacific Ring of Fire explained: where it is on the world map, the countries and trenches on it, why subduction causes it, and whether India lies… Mar 201920 min read Global Distribution of Soils: World Soil Types, the 12 Soil Orders and Soil Zones Soil orders explained: the 12 world soil types of USDA soil taxonomy, where each is found, zonal, intrazonal and azonal soils, and India's soil orders. Feb 201911 min read Soil Profile and Soil Horizons: Layers of Soil, Diagram and the Solum What is soil profile? The layers of soil, the O, A, E, B, C and R horizons, the solum, eluviation and illuviation, with a soil profile… Feb 201913 min read Leaching of Soil: Meaning, Process, Eluviation and Illuviation Leaching meaning in geography: how water washes soluble minerals down through soil, eluviation and illuviation, laterite and the effects of leaching. Feb 201914 min read Genesis of Soil: Soil Formation Process and the Five Factors of Soil Formation Soil formation explained: how weathered rock becomes soil, the five factors of soil formation (CLORPT), soil-forming processes and soil structure. Feb 201915 min read Time Zones and the International Date Line: Longitude, UTC and IST Time zones and the International Date Line explained: longitude and time, UTC and GMT, Indian Standard Time at 82.5 E, a world time zone map and… Feb 201917 min read Theory of Isostasy: Meaning, Airy and Pratt Models and Isostatic Adjustment What is isostasy? The theory of isostasy in geography: how the crust floats on the mantle, the Airy and Pratt models, Heiskanen and isostatic adjustment. Nov 201817 min read Hot Deserts of the World: Why They Form at 20 to 30 Degrees Latitude Why hot deserts form at 20-30 degrees: the Hadley cell, subtropical high and cold currents, with a world deserts map, hot vs cold deserts and UPSC… Nov 201823 min read