sedimentary rocks

The next time you're at a beach, grab a handful of sand. This material is sediment. Sediment carried by water and wind is deposited in layers. When sediment becomes cemented together it forms sedimentary rocks. These rocks are the best places to search for fossils.

Name Origin: comes from the Latin sedimentum, which means "act of settling"
Description: When rocks weather, they break down into little bits. After a very long time, these tiny particles can get pressed together to form new rocks.
Significance: These rocks provide the most clues about the history of life on Earth.

Image credits: courtesy of AMNH.