Describe process relative dating
Clues like this have helped scientists learn that Earth's surface features have changed many times.
Imagine if you needed to think about one million, 100 million, or even several billion years. Have places like the Grand Canyon and the Mississippi River been around for all of those years, or were they formed more recently?
In the process of relative dating, scientists do not determine the exact age of a fossil but do learn which ones are older or younger than others.
They saw that the fossils in older rocks are different from the fossils in younger rocks.
Places that now have tall mountains may have once been low, flat ground.
These kinds of changes take place over many millions of years, but they are still slowly going on today.