NDA Geography · Teaching notes

Earth's Structure, Landforms and Geological Time — NDA Geography

This is the largest chapter in NDA Geography after the two Indian-Geography chapters — 74 PYQs across 2017–2026, and the workhorse of the 'Apply' strand, because almost every question asks you to TRACE A PROCESS rather than recall an isolated fact. Where do mountains come from? Why is the outer core liquid? What turns sandstone into quartzite? The answers follow from the mechanism, not from a memorised list. So the chapter teaches in one long arc, from the inside of the planet outward and from building forces to breaking forces: (1) Earth's interior and plate tectonics — the layers, the discontinuities, and the moving plates that drive everything else; (2) Earthquakes and seismic waves — the energy released when plates move, and how those waves let us X-ray the interior; (3) Volcanoes and igneous activity — magma reaching the surface, and the rocks it forms; (4) Rocks, minerals and geological time — the rock cycle (igneous, sedimentary, metamorphic) and the eras of Earth history; (5) Weathering and denudation — how exposed rock is broken down in place; (6) Landforms and mass movements — the surface features rivers, glaciers, wind, the sea and gravity carve and build; (7) Soils — the thin living skin that weathering and climate produce on top. 30 concepts, every PYQ tagged. The endogenic half (1–3) carries the HARD questions; the exogenic half (4–7) is recall-friendly named-fact territory.