Question

Why is the upper mantle called the atmosphere?​

Answer 1

$\huge{\underline{\underline{\sf{\purple{ﾑɳรᏇɛƦ࿐}}}}}$

The upper mantle is called asthenosphere, It is called weak layer because it is in liquid state where rock material deforms more readily, and magma formation takes place.

Answer 2

Answer:

The upper mantle is called asthenosphere is a Greek word meaning 'weak'. It is called weak layer because it is in liquid state where rock material deforms more readily, and magma formation takes place.