(A) What are the two parts of the crust?
What is the basis of classification?
(B) Why is the upper mantle called the
asthenosphere?
(C) Magnetosphere of the earth is a result
of rotation. Explain.
Answers
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6
Answer:
a}there are two parts of the crust ,continental crust and oceanic crust .the classification is based on the composition of layers.
1.continental crust is mainly composed of silica (si) and aluminium (al). it is also known as 'sial'.the density of continental crust is 2.65 to 2.90 gm/cm3.
2.oceanic crust is composed of slice(si) and magnesium (mg). it is also known as 'sima'.its dentist is 2.9 to 3.3 gm/cm3.
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3
Answer:
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Explanation:
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