What best describes why the upper part of the mantle, called the asthenosphere, is important in plate tectonics?

Question

Quizplus · Accepted Answer

The upper part of the mantle, called the asthenosphere, is important in plate tectonics because it is hot and plastic like, allowing the overlying plates to slide or move. This movement of plates is the basis for plate tectonics and the formation of features such as mountains, volcanoes, and earthquakes.

What Best Describes Why the Upper Part of the Mantle