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This channel provides notes from different major books like D.R. khullar, G.C leong etc

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Queries - @Upscgeographybot
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β–  SOURCES OF INFORMATION ABOUT THE INTERIOR. [ PART 1]

#interiorofearth

β–‘ DIRECT SOURCES

β—‡ Deep earth mining and drilling reveal the nature of rocks deep down the surface.

β—‡ But as mining and drilling are not practically possible beyond a certain depth, they don’t reveal much information about the earth’s interior.

β—‡ Mponeng gold mine (deepest mine in the world) and TauTona gold mine (second deepest mine in the world) in South Africa are deepest mines reaching to a depth of only 3.9 km.

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β—‡ Volcanic eruption forms another source of obtaining direct information.

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β–  SOURCES OF INFORMATION ABOUT THE INTERIOR. [ PART 2]

#interiorofearth

INDIRECT SOURCES.


β–‘ Seismic waves

β—‡ They are the most important source available to understand the layered structure of the earth.

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

β–‘ Meteorites

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

β–‘ Gravitation

β—‡ 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.

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

β—‡ The gravity values also differ according to the mass of material.

β–‘ Magnetic field

β—‡ The geodynamo effect helps scientists understand what's happening inside the Earth's core.

β—‡ Shifts in the magnetic field also provide clues to the inaccessible iron core.

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