Question

write three characteristics of each of the following a.crust b.mentle c.core​

Answer 1

Answer:

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Crust

The crust is the outermost layer of the earth' s surface.

The thickness of the crust varies from 5-8km beneath the oceans and to an average of 35 km under the continental landmass.

The main elements that make up the crust are silicon (SI),aluminum (AL)and magnesium (MG).

The main components of the continental landmass are silicon and aluminum.Thus ,it is called sial.

The oceanic crust is called sima as it is made up of silicon and magnesium.

The density of the crust is less than 3g/cc.The oceanic crust is denser than the continental crust.

Mantle

The layer below the crust is called the mantle.

The mantle is 2,900 km thick.

It is mostly made up of silicon ,iron and magnesium.

The mantle consists of the two layers ---the upper mantle and the lower mantle.

The average temperature of the upper mantle is 870 degree Celsius,while the lower mantle has an average temperature of 2,200 degree Celsius.

The mantle is in a semi-solid,plastic state.

Core

The inner most layer of the earth is called the core.

It's thickness is about 3,500 km

It is made up of nickel,and iron and hence is known as nife.

It's density is about 11g /cc.The core is divided into the outer core and the inner core.

The outer core has as temperature of 3700 degree Celsius and is a molten state.

The inner core has a temperature of about 5000 degree Celsius but is still in a solid state. This is because of the extreme pressure exerted by the weight of the rocks that lie above it .

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