Gaseous rock Igneous rock Sedimentary rock Metamorphic rock
I gave my students this multiple choice question: Pumice is formed when lava from a volcano cools. Which rock type is pumice?

Only one answer is correct among these 4 choices:
- Gaseous rock
- Igneous rock
- Sedimentary rock
- Metamorphic rock

Could you tell me which one is correct?

Igneous rock