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

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 answer

The student should label the arrow from the picture of obsidian (igneous rock) to the picture of slate (metamorphic rock) as "metamorphism" or "heat and pressure." This indicates the process by which igneous rock can be transformed into metamorphic rock under extreme conditions of heat and pressure.