SOURCES OF INFORMATION ABOUT THE INTERIOR. [ PART 2]: UPSC Daily Important Topic | 25 April 2022

April 25, 2022

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INDIRECT SOURCES.

□ Seismic waves

◇ They are the most important source available to understand the layered structure of the earth.

◇ The velocity of seismic waves changes as they travel through materials with different elasticity and density.

□ Meteorites

◇ Meteorites and Earth are born from the same nebular cloud. Thus, they are likely to have a similar internal structure.

□ Gravitation

◇ The gravitation force (g) is not the same at different latitudes on the surface. It is greater near the poles and less at the equator.

◇ This is because of the distance from the centre at the equator being greater than that at the poles.

◇ The gravity values also differ according to the mass of material.

□ Magnetic field

◇ The geodynamo effect helps scientists understand what’s happening inside the Earth’s core.

◇ Shifts in the magnetic field also provide clues to the inaccessible iron core.