Summary:

Earth scientists use what they know about Earth in the present to figure out what happened in the past.
Rocks formed from volcanoes, oceans, rivers, and many other features are deciphered by looking at the geological work those features do today.
The present is the key to the past, according to James Hutton in the late 1700s.
The La Brea Tar Pits contain a massive collection on animals.
But how did all these animals die, and how did they get there?
In this video by Science Friday, researchers explain how these processes occurred and what they tell us about Los Angeles.

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