Question

rocks change because of intense heat and/or pressure. the deeper a rock is in the earth, the more pressure it is under. there is also pressure from the boundaries of tectonic plates pushing together. heat can come from being exposed to the hot material below the earths crust. remember that metamorphic rocks dont melt from heat - igneous rocks form from liquid rock. the heat and pressure that form metamorphic rock changes an existing rocks structure. its like a ball of raw pizza dough being flattened and baked in the oven. it doesnt melt, just changes form!
slate is a metamorphic rock formed from the sedimentary rock, shale. gneiss is another metamorphic rock formed from granite, an igneous rock. marble forms when limestone morphs from heat and pressure.
which of the following describes how metamorphic rock forms?
choose one option
a tectonic plate boundaries break apart an existing parent rock.
b an igneous rock deep in the earth is exposed to hot material.
c molten rock solidifies and hardens on top of the earths crust.

Explanation:

The text states that metamorphic rocks form when existing parent rocks change due to intense heat and/or pressure. Option B aligns with this as it mentions an igneous rock (a type of parent rock) deep in the Earth (where pressure is high) being exposed to hot material (heat source). Option A is incorrect as it mentions tectonic plate boundaries breaking apart rocks, which is not the formation process. Option C describes the formation of igneous rocks (molten rock solidifying) not metamorphic rocks.

Answer:

B. An igneous rock deep in the Earth is exposed to hot material.