Question

Which is needed to turn an igneous rock or sedimentary rock into a metamorphic rock?(1 point)
Responses

heat and pressure
heat and pressure

freezing and cementation
freezing and cementation

erosion and deposition
erosion and deposition

melting and cooling

Answer 1

heat and pressure

Metamorphic rocks form when existing igneous or sedimentary rocks are changed by heat and pressure (without melting). The other choices form sedimentary (erosion/deposition, cementation) or igneous (melting/cooling) rocks.