Question

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.​

Answer 1

Answer:

(A) 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.

(B) The asthenosphere is known to be for its weak layer in the upper mantle. The asthenosphere is made of solid rock, when given heat and pressure, the rocks flow like a liquid. ... The name asthenosphere is taken from Greek which means weak sphere.

(C) Earth's magnetic field is developed due to a phenomenon called dynamo effect. ... This electric current is a result of the spiral eddies generated due to earth's rotation and vertical currents formed due to the temperature difference between the outer core and inner core.