Question

The thickness of the mantle is about ?
a. 2900km
b. 2600km
c. 2500km
d. 2800km

Answer 1

Hint:
Mantles are mostly solid bulk of the Earth's interior. The mantle lies between the earth's dense, super-heated core and its thin outer layer, the crust. The mantle is about 2,900 kilometers thick and makes up 84% of the Earth's total volume.

Complete solution:
 A mantle is a layer inside the crust of a planet bound by a core at the bottom and by a crust. Mantles are made up of rock or ice, and are usually the largest and most massive layer of planetary bodies. Mantle is characterized by planetary bodies that undergo differentiation by density. All terrestrial planets (including Earth), many asteroids, and some planetary moons have mantles.

The earth's crust is a layer between silicate rock and the outer core. Its mass 24 kg is 67% of the Earth's mass. It has a thickness of 2900 kilometers (1,00) miles which is about a7% of the Earth's volume. It is mainly solid but in geological time it behaves as a viscous fluid. Partial melting of the upper cover produces mid-sea ridges on the oceanic crust, and partial melting produces the subduction zone of the upper cover on the continental crust.

The mercury has a silicate mantle about 490 km thick, accounting for only 28% of its mass. The silicate mantle of Venus is about 2 thick 500 km thick, whose mass is about 0%. The silicate mantle of Mars is about 1600 km thick of its mass, and can be represented by chassignite meteorites.


Hence, the correct answer is option A.

Note:
The silicate mantle of the Earth's moon is about 1300–1400 km thick, and the mare is the source of the basal. The lunar pole may possibly be exposed in the South Pole – Aitken basin or the Chrysium basin. The lunar mantra has a seismic dissection at 500 km depth, most likely related to composition changes.