metamorphic rock to igneous rock igneous rock to metamorphic rock metamorphic rock to sedimentary rock sedimentary rock to metamorphic rock
I gave my students this multiple choice question: Which transition is most responsible for gaps in the fossil record?

Only one answer is correct among these 4 choices:
- metamorphic rock to igneous rock
- igneous rock to metamorphic rock
- metamorphic rock to sedimentary rock
- sedimentary rock to metamorphic rock

Could you tell me which one is correct?

sedimentary rock to metamorphic rock