The rock cycle is a continuous process that changes materials found in

a. both earths lithosphere and mantle.

b. only in earths lithosphere.

c. only earths mantle.

d. in neither the Earth's lithosphere nor the Earth's mantle.

Answer: a. both earths lithosphere and mantle.

The rock cycle can be defined as changes that occur in the rocks and constituent sediments, which brings changes in the physical forms of rocks. The igneous rocks can change into metamorphic rocks. The metamorphic rocks can change into igneous or sedimentary rocks. Both lithosphere and mantle are important for the rock cycle. The earth's mantle produces heat, pressure along with the volcanic eruption. The magma solidifies on the earth crust which is also called as lithosphere results in the formation of rocks.

A. both Earth's lithosphere and mantle.