Physical Geography Cheat Sheet

The core ideas of Physical Geography distilled into a single, scannable reference — perfect for review or quick lookup.

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Quick Reference

Plate Tectonics

The theory that Earth's outer shell (lithosphere) is divided into several large plates that float on the semi-fluid asthenosphere and move relative to one another, driven by convection currents in the mantle. Plate interactions cause earthquakes, volcanism, mountain building, and ocean basin formation.

The Water Cycle (Hydrological Cycle)

The continuous movement of water through the Earth system via evaporation, transpiration, condensation, precipitation, infiltration, surface runoff, and groundwater flow. This cycle redistributes water and energy across the planet and is fundamental to weather, climate, and life.

Weathering and Erosion

Weathering is the in-place breakdown of rocks and minerals by physical (mechanical), chemical, or biological processes. Erosion is the transport of weathered material by agents such as water, wind, ice, or gravity. Together they shape landforms over time.

Climate Zones and Classification

The systematic categorization of Earth's climates based on temperature, precipitation, and seasonal patterns. The most widely used system is the Koppen climate classification, which divides climates into five major groups: tropical, arid, temperate, continental, and polar.

Glaciation and Glacial Landforms

The process by which glaciers form, advance, and reshape the landscape through erosion (plucking and abrasion) and deposition. Glacial processes have sculpted much of the terrain in higher latitudes and altitudes, leaving distinctive landforms.

Biogeography

The study of the geographic distribution of species and ecosystems across space and through geological time. It examines why organisms live where they do and how factors like climate, geology, and evolution influence biodiversity patterns.

Soil Formation (Pedogenesis)

The process by which soil develops from parent material through the combined influence of five soil-forming factors identified by Hans Jenny: climate, organisms, relief (topography), parent material, and time (collectively remembered as CLORPT).

Atmospheric Circulation

The large-scale movement of air across the Earth's surface driven by differential solar heating, the Coriolis effect, and pressure gradients. The three-cell model (Hadley, Ferrel, and Polar cells) describes the major global wind patterns and pressure belts.

Fluvial Processes

The set of processes associated with rivers and streams, including erosion, transportation, and deposition of sediment. Fluvial geomorphology studies how rivers shape the landscape, form drainage networks, and create features such as floodplains, deltas, and meanders.

Natural Hazards and Geomorphic Processes

Extreme natural events that arise from physical geographic processes and pose risks to human populations and infrastructure. These include earthquakes, volcanic eruptions, floods, landslides, hurricanes, and tsunamis, all of which are studied by physical geographers.

Key Terms at a Glance

Ablation:The loss of ice or snow from a glacier through melting, sublimation, calving, or wind erosion.

Alluvium:Unconsolidated sediment deposited by flowing water, typically found in riverbeds, floodplains, and deltas.

Asthenosphere:The semi-fluid, ductile layer of the upper mantle beneath the lithosphere on which tectonic plates move.

Attrition:A type of erosion where rocks and sediment carried by water, wind, or ice collide with each other and become smaller and more rounded.

Biome:A large-scale ecological community classified by its dominant vegetation type and climate, such as tropical rainforest, desert, tundra, or grassland.

Caldera:A large, bowl-shaped volcanic depression formed when a volcano's magma chamber empties and the overlying structure collapses.

Cirque:An amphitheater-shaped, bowl-like depression carved by glacial erosion at the head of a valley glacier.

Delta:A landform created by the deposition of sediment carried by a river as the flow enters a slower-moving or standing body of water.

Denudation:The overall lowering of a land surface through the combined processes of weathering, erosion, and mass wasting.

Drumlin:An elongated, streamlined hill of glacial till shaped by the movement of a glacier, with its steeper end facing the direction from which the ice advanced.

Eolian Processes:Geological processes related to wind activity, including erosion, transportation, and deposition of sediment. Dominant in arid and coastal environments.

Estuary:A partially enclosed coastal body of water where freshwater from rivers mixes with saltwater from the ocean, creating a brackish environment.

Folding:The bending and deformation of rock layers due to compressional tectonic forces, creating features such as anticlines and synclines.

Graben:A depressed block of land bordered by parallel faults, formed by extensional tectonic forces. An example is the East African Rift Valley.

Infiltration:The process by which water on the ground surface enters the soil, influenced by soil permeability, vegetation cover, and rainfall intensity.

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