Question

The layer of the earth where mantle convection occurs and on which the earths crust rests is the _

Answer 1

In the passage this question was provided for, you should have been able to locate the fallowing text: "the outer layer of the mantle; made up of plastic or semi-molten rock" and many others to imply this answer.

Answer: Asthenosphere

Answer 2

Salutations!

The layer of the earth where mantle convection occurs and on which the earths crust rests is the ___________.

The layer of the earth where mantle convection occurs and on which the earths crust rests is the asthenosphere. Its the outer layer of the mantle just below the lithosphere. The plate tectonics movements etc doesn't heat up, its remained as plastic due to the pressure.

Hope I helped :D