- Marine animals are water animals
- Marine fossils means fossils of marine animals
- So, marine fossils are fossils of water animals

- Marine fossils are fossils of water animals
- Marine fossils are found in mountains
- So, fossils of water animals are found in mountains

- Fossils of water animals are found in mountains
- If fossils of a water animal or plant are found in a place then that place used to be covered by water in the past
- Therefore, the mountains used to be covered by water in the past

- The mountains used to be covered by water in the past
- If something used to be in the past then that something has changed
- A mountain is a kind of environment
- A body of water is a kind of environment
- Hence, the environment has changed from a body of water to mountains

- The environment has changed from a body of water to mountains
- Environments are found on the crustal surface of earth
- So, the environments on the crustal surface of earth have changed from a body of water to mountains

Therefore, the environments on the crustal surface of earth have changed from a body of water to mountains
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?
Context: - Environments are found on the crustal surface of earth 
- Marine animals are water animals 
- Marine fossils means fossils of marine animals 
- Marine fossils are found in mountains 
- If something used to be in the past then that something has changed 
- If fossils of a water animal or plant are found in a place then that place used to be covered by water in the past 
- A mountain is a kind of environment 
- A body of water is a kind of environment