Geography Lessons 2: Understanding Physical Landscapes & Advanced Mapping Lesson Objectives By the end of this guide, you will be able to:

Identify major landforms and water bodies. Explain the processes that shape Earth’s surface (weathering, erosion, plate tectonics). Read and interpret topographic maps. Calculate gradient and scale.

Part 1: Key Landforms & Their Formation A. Major Landform Categories | Category | Examples | Formation Process | |----------------|---------------------------------------|----------------------------------| | Mountains | Himalayas, Andes | Tectonic collision/volcanism | | Plateaus | Tibetan Plateau, Deccan Plateau | Lava extrusion / uplift | | Plains | Great Plains, Indo-Gangetic Plain | Sediment deposition | | Valleys | Rift Valley, U-shaped valley | Glacial or river erosion | | Deserts | Sahara, Gobi | Rain shadow / aridity | B. Water Bodies

Rivers – Form drainage basins; erode, transport, deposit sediment. Lakes – Formed by glacial action, tectonics, or volcanic craters. Oceans & Seas – Cover 71% of Earth; currents influence climate. Groundwater – Aquifers; karst topography from limestone dissolution.

C. Geomorphic Processes

Weathering (breakdown in place)

Physical (freeze-thaw) Chemical (oxidation, carbonation) Biological (roots, burrowing animals)

Erosion (movement of material)

Water, wind, ice, gravity

Plate Tectonics

Convergent boundaries → mountains, trenches Divergent boundaries → mid-ocean ridges, rift valleys Transform boundaries → earthquakes (e.g., San Andreas Fault)

Part 2: Topographic Maps – Reading the Terrain A. What is a Topographic Map? A detailed representation of natural and man-made features, using contour lines to show elevation. B. Contour Line Rules