A student is using images of rocks to make a rock cycle diagram. The table describes the rocks the student is using:

Question

Name Type
metamorphic slate
sedimentary limestone
igneous obsidian
Which label should the student add to an arrow from the picture of obsidian to the picture of slate?

(1 point)
Responses

heat and pressure
heat and pressure

cooling
cooling

years of erosion
years of erosion

pressure and cementation

Answer 1

The correct label for the arrow from the picture of obsidian (an igneous rock) to the picture of slate (a metamorphic rock) should be:

heat and pressure

This is because the process that transforms an existing rock (in this case, an igneous rock) into a metamorphic rock involves heat and pressure over time.