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

cooling
cooling

pressure and cementation
pressure and cementation

years of erosion
years of erosion

heat and pressure

Answer 1

The correct label for the arrow from the picture of obsidian (an igneous rock) to the picture of slate (a metamorphic rock) is heat and pressure.

This is because slate is formed from the metamorphism of shale (a sedimentary rock) under heat and pressure, and while obsidian does not directly convert to slate, the concept of transitioning to a metamorphic rock from an igneous rock involves similar geological processes.

Therefore, "heat and pressure" is the most appropriate choice in this context.