where the rocks were found. how the rocks were formed. the composition of the rocks. the color and shape of the rocks.
I gave my students this multiple choice question: Rocks found on Earth are classified as sedimentary, metamorphic, or igneous based on

Only one answer is correct among these 4 choices:
- where the rocks were found.
- how the rocks were formed.
- the composition of the rocks.
- the color and shape of the rocks.

Could you tell me which one is correct?

how the rocks were formed.