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English · हिन्दी · తెలుగు · தமிழ் · മലയാളം · मराठी · ಕನ್ನಡ

The Earth: its place, motions and interior

The Earth: its place, motions and interior for UPSC Prelims and Mains, taught in 3 parts. Each part has tables, exam traps, a recap and practice questions, and every paragraph is explained in Tamil.

Quick recap: Quick recap: the Earth, its motions and interior on one page

All three parts condensed for quick revision: the solar system and the Earth's shape, rotation, revolution and seasons, latitude, longitude and time, IST and the Date Line, seismic waves and the shadow zone, the Earth's layers, and the three families of rock, with a one-table overview and eight mixed questions.

Parts of this chapter

Part 1

The Earth in the solar system: shape, motions and seasons

The solar system and the IAU's 2006 definition of a planet, the Earth's shape and size, rotation and revolution, perihelion and aphelion, the tilt of the axis and the seasons, solstices and equinoxes, and how day length changes with latitude. Part 2

Latitude, longitude and time

Latitude, the named parallels and the heat zones, India on the grid and the eight states on the Tropic of Cancer, longitude and the Prime Meridian, how longitude fixes local and standard time with worked examples, Indian Standard Time and the International Date Line. Part 3

Inside the Earth: layers, seismic evidence and rocks

How the interior is known from direct and indirect sources, P, S and surface waves, the shadow zone, the crust, mantle and core with the Moho, Gutenberg and Lehmann boundaries, the elements and minerals of the crust, igneous, sedimentary and metamorphic rocks, and the rock cycle.

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