Q3 of 30 Page 15

Answer the following

What are the two parts of the crust? What is the basis of classification?

Earth’s crust is the outermost layer. It can be classified into Continental crust and oceanic crust, on the basis of chemical composition. The continental crust is made up of silica and aluminium. Oceanic crust is made up of silica and magnesium.


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2

Tell whether right or wrong. Correct the wrong statement

Secondary waves cannot pass through outer core.

 2

Tell whether right or wrong. Correct the wrong statement

Continental crust is made up of silica and magnesium

 3

Answer the following

Why is the upper mantle called the asthenosphere?

 3

Answer the following

Magnetosphere of the earth is a result of rotation. Explain.