Q3. Answer the following
(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
Explanation:
upper crust and lower crust
Answer:
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1) Earth's crust is divided into two types: oceanic crust and continental crust. The transition zone between these two types of crust is sometimes called the Conrad discontinuity. Silicates (mostly compounds made of silicon and oxygen) are the most abundant rocks and minerals in both oceanic and continental crust.
2)The upper mantle is not uniform throughout. Below the lithosphere is a layer of upper mantle called the asthenosphere. This is made up rock that is fluid and can move.It is this fluidity that powers the movement of the tectonic plates of the Earth's crust.
3)It is a well-known fact that Earth has a powerful magnetic field with both South and North poles.
The magnetic field of the earth is to be produced deep down in the core of Earth. It is what causes earth’s magnetic field.
The rotation axis is entirely different from magnetic poles.
The big variation creates some force for the globe for rotating on its own axis.
This similar technique is a case with every planet in the huge Solar System.
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Explanation: