Question

the rock cycle describes the transitions through geologic time among the three main rock types: sedimentary, metamorphic, and igneous. as the diagram illustrates, each of the types of rocks is altered or destroyed when it is forced out of its equilibrium conditions. the three types of rocks are identified on the diagram as; igneous (3), sedimentary (6), and metamorphic (8). given this information, which process is most likely occurring at 4? a melting b erosion c crystallization d tectonic burial what process is most likely occurring at point 9 in the diagram?

Explanation:

In the rock - cycle, when a rock is forced out of its equilibrium conditions, melting is a process that can transform rocks. Erosion is related to the wearing away of rocks by external forces like wind and water. Crystallization is the formation of crystals from a melt or solution. Tectonic burial involves rocks being pushed down into the Earth's crust due to tectonic forces. Point 4 in the rock - cycle is likely related to melting as it often represents the transition of rocks to a molten state.

Answer:

A. melting