Internal Structure - Internal Structure
Internal Structure (1) Add new question
Question
Q: Explain internal structure of the earth?
| Option | Answer | Is Correct |
|---|---|---|
| 1 | The interior of the Earth, like that of the ether terrestrial planets, is chemically divided into layers. The Earth has an outer silicate solid crust, a highly viscous mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core. The crust is separated from the mantle by the Mohorovieia discontinuity, and the thickness of the crust varies: averaging 6 km under the oceans and 30—50 km on the continents. The geologic component avers of the Earth are at the following depths below the surface: 0—60 | |
| 2 | The internal heat of the planet is most likely produced by the radioactive decay of potassium-40. uranium-238 and thorium.232 isotopes. All three have half.life decay periods of more than a billion years. At the center of the planet, the temperature may be up to 7,000 K and the pressure could reach 360 GPa. A portion of the core’s thermal energy is transported toward the crust by Mantle plumes; a form of convection consisting of upwellings of higher—temperature rock. These plumes can produce hot spots and flood basalts. |
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