Question

The plates and the upper mantle __ on the lower molten part of the mantle.​

Answer 1

Explanation:

lithosphere

The tectonic plates are made up of Earth's crust and the upper part of the mantle layer underneath. Together the crust and upper mantle are called the lithosphere and they extend about 80 km deep. The lithosphere is broken into giant plates that fit around the globe like puzzle pieces

Answer 2

Answer:

The crust and part of the upper mantle move around due to convection from heat in the Earth's interior. This is called plate tectonics. This movement of tectonic plates causes earthquakes and forms mountains. ... Beneath the lower mantle, the core makes up the Earth's center and contains mostly iron and nickel.