1. What is a change to one or more rock layers that breaks up or disturbs the original horizontality? 2. If you find a fossil of a marine organism embedded in rock, what is that evidence of?
3. Earth's provides excellent clues about past climates, as well as the kinds of organisms that have inhabited the planet during different time periods.
4. We can understand the mountain ranges and volcanic islands we see on Earth by studying the that formed them.