Some rock layers are very thick. Some species have become extinct. Marine fossils are found in mountain areas. Igneous rock is found on all tectonic plates.
I gave my students this multiple choice question: The surface of Earth is constantly changing. Which of these findings provides the best evidence that the crustal surface of Earth has changed over time?

Only one answer is correct among these 4 choices:
- Some rock layers are very thick.
- Some species have become extinct.
- Marine fossils are found in mountain areas.
- Igneous rock is found on all tectonic plates.

Could you tell me which one is correct?

Marine fossils are found in mountain areas.