crystallized into natural glass. exposed to great temperature. melted into liquid magma. broken down by weathering.
I gave my students this multiple choice question: In the rock cycle, sedimentary rock forms when rock is

Only one answer is correct among these 4 choices:
- crystallized into natural glass.
- exposed to great temperature.
- melted into liquid magma.
- broken down by weathering.

Could you tell me which one is correct?

broken down by weathering.