Fact 1: Fossils are formed when layers of sediment cover the remains of organisms over time.

Fact 2: Most fossils are preserved by the sedimentation process of water.

Given the two facts above, answer the question "What is sedimentation caused by?" with the following options: 
- salmon
 - streams
 - wind
 - storms
 - rain
 - a wave
 - erosion
 - water


 

        water 