KSEAB II PUC Geography cheat sheet

Geomorphology - Endogenic forces (diastrophism, volcanism) build relief; exogenic forces (weathering, erosion, deposition) wear it down; the cycle runs youth–maturity–old age (Davis).

Rock cycle: igneous forms from magma/lava; sedimentary from compaction of sediments in strata; metamorphic from heat/pressure acting on either; limestone becomes marble, sandstone becomes quartzite, granite becomes gneiss.

Weathering types: physical (frost, exfoliation, thermal), chemical (solution, oxidation, carbonation), biological; carbonation on limestone produces karst - swallow holes, dolines, stalactites, stalagmites.

Fluvial landforms: V-shaped valley and waterfall (youth), meander and floodplain (maturity), ox-bow lake, delta, and peneplain (old age); alluvial fans form where slope breaks.

Glacial landforms: cirque, arête, horn, U-shaped valley, hanging valley, moraine, drumlin, esker, outwash plain; fiords are drowned glacial valleys.

Aeolian landforms: barchan and seif dunes, yardang, mushroom rock, loess deposits; wind erosion dominates in hot deserts with sparse vegetation.

Coastal landforms: wave-cut platform and cliff (erosion); beach, spit, bar, tombolo, lagoon (deposition); coral reefs need warm shallow clear salt water.

Climatology - Insolation is highest near the equator and lowest at poles; temperature falls about 6.5°C per 1000 m ascent (normal lapse rate); inversion occurs on clear calm winter nights.

Pressure belts: equatorial low (ITCZ), subtropical highs near 30°, subpolar lows near 60°, polar highs; winds blow from high to low pressure, deflected by Coriolis force - right in the Northern, left in the Southern Hemisphere.

Planetary winds: trade winds (NE and SE), westerlies, polar easterlies; monsoon is a seasonal reversal driven by differential heating plus the ITCZ shift and jet stream.

Cloud types: cirrus (high, ice), cumulus (fair weather, vertical growth), stratus (layered, drizzle), nimbus (rain-bearing); cumulonimbus gives thunderstorms and hail.

Oceanography - Salinity averages about 35 ppt; highest in subtropical seas with high evaporation (Red Sea, Persian Gulf), lowest near equator, river mouths, and polar meltwater.

Ocean currents: warm currents flow from low to high latitudes (Gulf Stream, Kuroshio, North Atlantic Drift); cold currents flow poleward on western coasts (Labrador, Humboldt, Benguela) and cause fog and cold upwelling fisheries.

Tides: spring tide at new and full moon (Sun and Moon aligned); neap tide at quadrature (forces at right angles); semidiurnal tide has two highs and two lows daily.

Demographic transition stages: high stationary (high birth, high death), early expanding (death falls), late expanding (birth falls), low stationary (both low); India sits in late expanding.

Population density = total population ÷ total area; arithmetic density ignores arable land, physiological density relates people to cultivated area, agricultural density relates farmers to farmland.

Population pyramid shapes: expansive (broad base, high fertility, young population), constrictive (narrow base, ageing), stationary (straight sides); sex ratio = females per 1000 males.

Push factors (unemployment, poverty, conflict, disaster) drive out-migration; pull factors (jobs, education, health, security) attract; migration may be rural-urban, seasonal, or international.

Settlement types: compact/nucleated (defence, water, fertile plain), dispersed (hilly, pastoral, scattered farmland), linear (along road, river, or coast); rural settlements tie to site and situation.

Urban concepts: conurbation (merged cities), metropolis (population over one million in India), megacity (over ten million), primate city (disproportionately largest), CBD, slum, and squatter settlement.

Economic activity sectors: primary (extractive - farming, mining, fishing), secondary (manufacturing, processing), tertiary (services, trade, transport), quaternary (knowledge, research, IT).

Subsistence farming is for family consumption with small holdings; commercial farming is market-oriented with machinery and hired labour; plantation is a single cash crop on large estates with processing.

Industries locate by weight-losing vs weight-gaining logic: iron and steel near coal/iron ore, cotton textile near market or port, aluminium smelting near cheap power, software near skilled labour.

Physiographic divisions: Himalayas (young fold mountains), Indo-Gangetic Plain (alluvial), Peninsular Plateau (old crystalline, Deccan Trap basalt), Coastal Plains (eastern wider, western narrow), and Islands (Andaman & Nicobar, Lakshadweep).

Himalayan ranges north to south: Trans-Himalaya (Karakoram, Ladakh), Greater Himalaya (Himadri), Lesser Himalaya (Himachal - Pir Panjal, Dhauladhar), Shiwaliks; passes include Zoji La, Nathu La, Shipki La.

Rivers: Himalayan rivers are perennial (Indus, Ganga, Brahmaputra systems); peninsular rivers are seasonal (Godavari, Krishna, Kaveri, Narmada, Tapi); Ganga is the longest river wholly within India.

Climate is tropical monsoon: southwest monsoon (June–September) brings most rain; retreating monsoon (October–November) gives Tamil Nadu its rain; western disturbances bring winter rain to northwest India.

Rainfall decreases from the Western Ghats windward side eastward; Mawsynram/Cherrapunji in Meghalaya record the world's highest rainfall; Rajasthan's Thar is a rain-shadow desert.

Soils: alluvial (most extensive, fertile, Indo-Gangetic), black/regur (Deccan Trap, moisture-retentive, cotton), red (crystalline, iron-rich), laterite (heavy rain, leached), arid, mountain, and saline-alkaline soils.

Vegetation: tropical evergreen (over 200 cm rain), deciduous/monsoon (100–200 cm, teak, sal), thorn and scrub (below 75 cm), montane, and mangrove (Sundarbans, tidal).

Agriculture: rice needs over 100 cm rain and clayey soil; wheat needs cool growing season and 50–75 cm; cotton needs black soil; tea needs well-drained slopes; jute needs the Ganga-Brahmaputra delta.

Industry: iron and steel at Jamshedpur, Bhilai, Rourkela, Durgapur, Bokaro; cotton textiles at Mumbai and Ahmedabad; jute at Kolkata; sugar in Uttar Pradesh and Maharashtra; software in Bengaluru, Hyderabad, Pune.

Transport: Golden Quadrilateral links Delhi–Mumbai–Chennai–Kolkata; NH network is numbered by direction (odd north-south, even east-west); Konkan Railway runs along the west coast; major ports include Kandla, Mumbai, Chennai, Visakhapatnam, Paradip, Haldia.

Location: Karnataka lies between about 11°31' and 18°45' N and 74°12' and 78°40' E; it borders Maharashtra, Goa, Kerala, Tamil Nadu, Andhra Pradesh, and Telangana.

Physiographic divisions: Coastal Plain (Karavali), Malnad (Western Ghats), and Maidan (Bayaluseeme) split into northern and southern; highest peak is Mullayanagiri (1,930 m) in Chikkamagaluru.

Rivers: Krishna with tributaries Bhima, Tungabhadra, Ghataprabha, Malaprabha; Kaveri with Hemavati, Kabini, Shimsha; west-flowing Sharavathi, Kali, Netravati; waterfalls include Jog (Sharavathi) and Shivanasamudra (Kaveri).

Climate: tropical monsoon; heavy rainfall on the Western Ghats windward slope (Agumbe, Karkala), low rainfall in the eastern Maidan (Chitradurga, Ballari, drought-prone); southwest monsoon dominant.

Soils: red loamy in Malnad and south Maidan, black cotton in north Maidan (Dharwad, Belagavi), laterite on coastal uplands, alluvial along river valleys, coastal sandy soils.

Agriculture: ragi is the staple millet of the south Maidan; rice in coastal and canal areas; jowar in north Maidan; coffee in Chikkamagaluru, Kodagu, Hassan; arecanut in Shivamogga; sugarcane in Belagavi and Mandya; horticulture leads nationally in several crops.

Forests and wildlife: reserved forests in Malnad and coastal belt; Bandipur, Nagarahole, Anshi-Dandeli, Bhadra, and Bannerghatta national parks; Malnad holds moist deciduous and evergreen patches.

Industry: IT and electronics in Bengaluru; aerospace at Bengaluru; steel at Bhadravati (VISL) and Toranagallu; cement in Kalaburagi region; sugar in Belagavi and Mandya; Mangaluru port and petrochemical/refinery activity.

Population: Kannada is the official language; Bengaluru is the most populous district, Kodagu among the least; literacy is above the national average, with a high urban share driven by Bengaluru.

Transport: Bengaluru is the air hub; Mangaluru is the major all-weather port; rail links include the Konkan Railway along the coast; NH 44 and NH 48 are major corridors; Bengaluru has Namma Metro.

Scale types: statement (1 cm = 1 km), representative fraction (1:50,000), and graphical/linear scale; RF is unit-free and comparable across maps.

Toposheet index: Survey of India sheets are 1:1,000,000 (degree sheet), then subdivided into 1:250,000, 1:50,000 (15' × 15'), and 1:25,000; each 1:50,000 sheet carries a reference like 48 P/12.

Grid references: eastings are read before northings (right then up); a four-figure reference gives a 1 km square, a six-figure reference locates within 100 m.

Contour rules: contours never cross except at an overhang; closely spaced contours mean steep slope; widely spaced mean gentle slope; V pointing uphill indicates a valley, V pointing downhill a spur.

Conventional signs on Indian toposheets: blue for water bodies, green for vegetation, black for cultural features (buildings, roads, boundaries), brown for contours, red for roads and settlements.

Settlement and drainage interpretation: compact clusters suggest nucleated villages on plains; linear settlement follows roads or canals; dendritic drainage indicates uniform rock, trellis indicates folded strata.

Statistical diagrams: bar graphs compare discrete categories; pie charts show parts of a whole (degrees = percentage × 3.6); line graphs show trends over time; choropleth uses shading for density data.

Climograph plots rainfall as bars and temperature as a line on the same month axis; a hythergraph plots temperature against rainfall to show climatic type.

Map projections: Mercator preserves shape (conformal) but exaggerates high-latitude area; conic suits mid-latitude countries; cylindrical suits world maps; azimuthal suits polar regions.

Identify sheet scale first: 1:50,000 sheets cover 15' × 15' with 2 cm grid squares equal to 1 km; 1:25,000 sheets cover 7'30" × 7'30".

Locate the sheet's latitudinal and longitudinal extent from the corner margin values, then use the grid to give any feature a six-figure reference.

Relief interpretation: spot heights (dot with number), triangulation stations (triangle with number), benchmarks (BM), and hachures; contour interval is stated in the legend.

Drainage pattern: radial around a peak, centripetal into a basin, dendritic on uniform rock, trellis on folded rock; stream order rises downstream and tributaries join at acute angles.

Land use reading: yellow/orange patches usually indicate cultivated land, green indicates forest or orchard, stippling indicates sand, blue lines indicate streams and canals.

Communication reading: metalled roads are double lines, unmetalled single lines, cart tracks dashed; railways show cross-ties; a rest house or dak bungalow marks a route halt.

Slope and gradient: gradient = vertical interval ÷ horizontal equivalent; convert map distance using the scale before dividing; express as a ratio or percentage.

Settlement function clues: a market, school, post office, and police station suggest a service centre; a factory symbol suggests an industrial node; a fort or temple suggests historical origin.

Cross-section (profile) drawing: plot each contour crossing on graph paper at its elevation, join smoothly, and label peaks, valleys, and steep segments to reveal the terrain profile.

Direction on a map: true north is grid north on most toposheets; magnetic north differs by declination; bearings are measured clockwise from north in degrees.

Distance measurement: use a string or divider for curved routes, then multiply by the scale factor; for 1:50,000, 1 cm on the map equals 0.5 km on the ground.

Area calculation: count full grid squares, add half for partial squares, then multiply by the ground area of one square (1 km² at 1:50,000 for a 2 cm square).

Mean, median, and mode summarise a data series; range = highest − lowest; standard deviation measures spread; these support interpretation of rainfall or population data.

Pie diagram construction: angle for each sector = (value ÷ total) × 360°; check that all angles sum to 360° before drawing.

Choropleth mapping requires data normalised by area (density, percentage), not absolute totals; use graded shades from light (low) to dark (high) with a legend.

Isopleth maps join points of equal value - isobars (pressure), isotherms (temperature), isohyets (rainfall), contours (elevation); interpolation between stations is required.

Flow-line and proportional circle maps show volume of movement or magnitude; circle area, not radius, should be proportional to the value.

Interpretation sequence for any toposheet: scale and extent, relief, drainage, vegetation, settlement, communication, then land use and function.

Endogenic forces: diastrophism (folding, faulting), volcanism, and earthquakes build relief; exogenic forces (weathering, erosion, deposition) wear it down in the geomorphic cycle.

Rock cycle: igneous from magma/lava; sedimentary from compaction of sediments; metamorphic from heat and pressure; limestone→marble, sandstone→quartzite, granite→gneiss.

Weathering types: physical (frost, exfoliation), chemical (solution, oxidation, carbonation), biological; carbonation on limestone produces karst features such as dolines and stalactites.

Fluvial landforms: V-shaped valley and waterfall (youth), meander and floodplain (maturity), ox-bow lake, delta, peneplain (old age); alluvial fans form where slope breaks.

Glacial landforms: cirque, arête, horn, U-shaped valley, hanging valley, moraine, drumlin, esker, outwash plain; fiords are drowned glacial valleys.

Aeolian and coastal landforms: barchan and seif dunes, yardang, loess; wave-cut platform and cliff (erosion); beach, spit, bar, tombolo, lagoon (deposition).

Coral reefs require warm, shallow, clear, salty water; fringing, barrier, and atoll are the three reef types, with atolls forming over subsiding volcanic islands.

Demographic transition stages: high stationary (high birth, high death), early expanding (death falls), late expanding (birth falls), low stationary (both low); India sits in late expanding.

Population density = total population ÷ total area; arithmetic density ignores arable land, physiological density relates people to cultivated area, agricultural density relates farmers to farmland.

Population pyramid shapes: expansive (broad base, high fertility), constrictive (narrow base, ageing), stationary (straight sides); sex ratio = females per 1000 males.

Push factors (unemployment, poverty, conflict, disaster) drive out-migration; pull factors (jobs, education, health, security) attract; migration may be rural-urban, seasonal, or international.

Settlement types: compact/nucleated (defence, water, fertile plain), dispersed (hilly, pastoral), linear (along road, river, coast); rural settlements tie to site and situation.

Urban concepts: conurbation (merged cities), metropolis (over one million in India), megacity (over ten million), primate city (disproportionately largest), CBD, slum, squatter settlement.

Economic sectors: primary (extractive), secondary (manufacturing), tertiary (services), quaternary (knowledge and IT); subsistence farming serves the family, commercial farming the market.

Physiographic divisions: Himalayas (young fold mountains), Indo-Gangetic Plain (alluvial), Peninsular Plateau (old crystalline, Deccan Trap basalt), Coastal Plains, and Islands.

Himalayan ranges north to south: Trans-Himalaya (Karakoram, Ladakh), Greater Himalaya (Himadri), Lesser Himalaya (Himachal), Shiwaliks; passes include Zoji La, Nathu La, Shipki La.

Rivers: Himalayan rivers are perennial (Indus, Ganga, Brahmaputra); peninsular rivers are seasonal (Godavari, Krishna, Kaveri, Narmada, Tapi); Ganga is the longest river wholly within India.

Climate is tropical monsoon: southwest monsoon (June–September) brings most rain; retreating monsoon (October–November) gives Tamil Nadu its rain; western disturbances bring winter rain to the northwest.

Rainfall decreases from the Western Ghats windward side eastward; Mawsynram and Cherrapunji in Meghalaya record the world's highest rainfall; Rajasthan's Thar is a rain-shadow desert.

Soils: alluvial (most extensive, fertile), black/regur (Deccan Trap, moisture-retentive, cotton), red (crystalline, iron-rich), laterite (heavy rain, leached), arid, mountain, saline-alkaline.

Vegetation: tropical evergreen (over 200 cm rain), deciduous/monsoon (100–200 cm, teak, sal), thorn and scrub (below 75 cm), montane, and mangrove (Sundarbans, tidal).

Location: Karnataka lies between about 11°31' and 18°45' N and 74°12' and 78°40' E; it borders Maharashtra, Goa, Kerala, Tamil Nadu, Andhra Pradesh, and Telangana.

Physiographic divisions: Coastal Plain (Karavali), Malnad (Western Ghats), and Maidan (Bayaluseeme) split into northern and southern; highest peak is Mullayanagiri (1,930 m) in Chikkamagaluru.

Rivers: Krishna with tributaries Bhima, Tungabhadra, Ghataprabha, Malaprabha; Kaveri with Hemavati, Kabini, Shimsha; west-flowing Sharavathi, Kali, Netravati; waterfalls include Jog and Shivanasamudra.

Climate: tropical monsoon; heavy rainfall on the Western Ghats windward slope (Agumbe, Karkala), low rainfall in the eastern Maidan (Chitradurga, Ballari, drought-prone); southwest monsoon dominant.

Soils: red loamy in Malnad and south Maidan, black cotton in north Maidan (Dharwad, Belagavi), laterite on coastal uplands, alluvial along river valleys, coastal sandy soils.

Forests and wildlife: reserved forests in Malnad and coastal belt; Bandipur, Nagarahole, Anshi-Dandeli, Bhadra, and Bannerghatta national parks; Malnad holds moist deciduous and evergreen patches.

Drainage divides: the Western Ghats form the main watershed, sending short swift rivers west and long rivers east across the Maidan toward the Bay of Bengal.

Identify sheet scale first: 1:50,000 sheets cover 15' × 15' with 2 cm grid squares equal to 1 km; 1:25,000 sheets cover 7'30" × 7'30".

Locate the sheet's latitudinal and longitudinal extent from the corner margin values, then use the grid to give any feature a six-figure reference.

Relief interpretation: spot heights (dot with number), triangulation stations (triangle with number), benchmarks (BM), and hachures; contour interval is stated in the legend.

Drainage pattern: radial around a peak, centripetal into a basin, dendritic on uniform rock, trellis on folded rock; stream order rises downstream and tributaries join at acute angles.

Land use reading: yellow/orange patches usually indicate cultivated land, green indicates forest or orchard, stippling indicates sand, blue lines indicate streams and canals.

Communication reading: metalled roads are double lines, unmetalled single lines, cart tracks dashed; railways show cross-ties; a rest house or dak bungalow marks a route halt.

Slope and gradient: gradient = vertical interval ÷ horizontal equivalent; convert map distance using the scale before dividing; express as a ratio or percentage.

Settlement function clues: a market, school, post office, and police station suggest a service centre; a factory symbol suggests an industrial node; a fort or temple suggests historical origin.

Cross-section (profile) drawing: plot each contour crossing on graph paper at its elevation, join smoothly, and label peaks, valleys, and steep segments to reveal the terrain profile.

Direction on a map: true north is grid north on most toposheets; magnetic north differs by declination; bearings are measured clockwise from north in degrees.

Distance measurement: use a string or divider for curved routes, then multiply by the scale factor; for 1:50,000, 1 cm on the map equals 0.5 km on the ground.

Area calculation: count full grid squares, add half for partial squares, then multiply by the ground area of one square (1 km² at 1:50,000 for a 2 cm square).

Scale types: statement (1 cm = 1 km), representative fraction (1:50,000), and graphical/linear scale; RF is unit-free and comparable across maps.

Grid references: eastings are read before northings (right then up); a four-figure reference gives a 1 km square, a six-figure reference locates within 100 m.

Contour rules: contours never cross except at an overhang; closely spaced contours mean steep slope; widely spaced mean gentle slope; V pointing uphill indicates a valley, V pointing downhill a spur.

Conventional signs on Indian toposheets: blue for water bodies, green for vegetation, black for cultural features, brown for contours, red for roads and settlements.

Mean, median, and mode summarise a data series; range = highest − lowest; standard deviation measures spread; these support interpretation of rainfall or population data.

Pie diagram construction: angle for each sector = (value ÷ total) × 360°; check that all angles sum to 360° before drawing.

Choropleth mapping requires data normalised by area (density, percentage), not absolute totals; use graded shades from light (low) to dark (high) with a legend.

Isopleth maps join points of equal value - isobars (pressure), isotherms (temperature), isohyets (rainfall), contours (elevation); interpolation between stations is required.

Flow-line and proportional circle maps show volume of movement or magnitude; circle area, not radius, should be proportional to the value.

Climograph plots rainfall as bars and temperature as a line on the same month axis; a hythergraph plots temperature against rainfall to show climatic type.

Map projections: Mercator preserves shape (conformal) but exaggerates high-latitude area; conic suits mid-latitude countries; cylindrical suits world maps; azimuthal suits polar regions.

Interpretation sequence for any toposheet: scale and extent, relief, drainage, vegetation, settlement, communication, then land use and function.