Geography series1 NDA/CDS 2 2026 |Lakshay |defence with Lakshay #ndaexam #cdse #upsc

NDA/CDS Geography by Lakshay 🌍
Topic: Interior Structure of the Earth
Understanding the Earth from inside is crucial for building strong geography concepts and analytical thinking for NDA/CDS.
🔹 Layers of the Earth:
Crust: Outermost layer (5–70 km), where we live; divided into continental & oceanic crust
Mantle: Extends up to ~2900 km; semi-solid, responsible for tectonic movements
Core: Innermost layer (~3500 km thick), mainly iron & nickel (NiFe)
🔹 Core Division:
Outer Core: Liquid state → responsible for Earth’s magnetic field
Inner Core: Solid due to immense pressure
🔹 Important Concepts:
Discontinuities:
Mohorovičić (Crust–Mantle)
Gutenberg (Mantle–Core)
Lehmann (Outer–Inner Core)
Sources of Knowledge:
Seismic waves (P & S waves)
Meteorites
Gravity & magnetic studies
🔹 Exam Focus 🎯:
Difference between P-waves & S-waves
Layers + depth + composition
Conceptual questions on magnetic field & plate tectonics
#nda #ssbinterview #motivation

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