intrusive igneous extrusive igneous clastic sedimentary organic sedimentary
I gave my students this multiple choice question: Florida has a large supply of phosphate that ancient seas deposited millions of years ago. The phosphate contains the remains of animals that were deposited in layers on the sea floor. Which type of rock did the phosphate become?

Only one answer is correct among these 4 choices:
- intrusive igneous
- extrusive igneous
- clastic sedimentary
- organic sedimentary

Could you tell me which one is correct?

organic sedimentary