Q.

The thickness of mantle is about


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a

2900 km

b

2500 km

c

2600 km

d

2800 km  

answer is A.

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Detailed Solution

From the outer core to just below the Earth's surface, the mantle is present. It is around 80% of the Earth's bulk and is 2900 km thick. The iron and magnesium silicates and oxides that make up the mantle are more akin to the rocks on the surface of the Earth than the core's constituents.
 
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