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.

A.  both Earth's lithosphere and mantle.

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.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.