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50+ Prelims Score Boosting Tricks (English Medium)

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50+ Prelims Score Boosting Tricks (Hinglish Medium | हिंदी माध्यम)

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■ SOURCES OF EARTH’S HEAT [PART 2]

#interiorofearth

2. Primordial heat

◇ Heat left over from Earth's formation known as the primordial heat.

◇ Primordial heat is the kinetic energy transferred to Earth by external impacts of comets and meteorites and the subsequent effects (friction caused by sinking of heavy elements like Fe, rising light elements like Si) and latent heat of crystallisation released as the core solidified.

▪︎@upsc_geography_notes

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50+ Prelims Score Boosting Tricks (English Medium)

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50+ Prelims Score Boosting Tricks (Hinglish Medium | हिंदी माध्यम)

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■ HOW ARE EARTHQUAKE WAVES PRODUCED ?

#interiorofearth

◇ The abrupt release of energy along a fault (sharp break in the crustal layer) causes earthquake waves. Rock layers along a fault tend to move in opposite directions due to the force excreted on them but are held in place by counteracting frictional force exerted by the overlying rock strata.

◇ The pressure on the rock layers builds up over a period and overcomes the frictional force resulting in a sudden movement generating shockwaves (seismic waves) that travel in all directions.

◇ The point where the energy is released is called the focus or the hypocentre of an earthquake. The point on the surface directly above the focus is called epicentre. An instrument called ‘seismograph’ records the waves reaching the surface.

▪︎@upsc_geography_notes

50+ Prelims Score Boosting Tricks (English Medium)

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50+ Prelims Score Boosting Tricks (Hinglish Medium | हिंदी माध्यम)

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■ TYPES OF SEISMIC WAVES OR EARTHQUAKE WAVES.

#interiorofearth

The seismic waves or earthquake waves are basically of two types —

◇ Body waves and

◇ Surface waves.

▪︎@upsc_geography_notes

50+ Prelims Score Boosting Tricks (English Medium)

50+ Prelims Score Boosting Tricks (Hinglish Medium | हिंदी माध्यम)

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■ BODY WAVES

#interiorofearth

Body waves are generated due to the release of energy at the focus and move in all directions travelling through the interior of the earth. Hence, the name body waves.

There are two types of body waves:-

◇ Primary - waves.

◇ Secondary - waves.

▪︎@upsc_geography_notes.

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