Question : The upper portion of the mantle is called ____.
Option 1: asthenosphere
Option 2: barysphere
Option 3: mesosphere
Option 4: lithosphere
Correct Answer: asthenosphere
Solution : The correct answer is asthenosphere .
The upper portion of the mantle is known as the asthenosphere. There are three layers of the earth, namely, the crust, mantle, and core. The asthenosphere is a weak portion below the lithosphere. It is generally hotter and more viscous than the lithosphere. The asthenosphere is composed mainly of magnesium and iron.
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