Fact 1: If fossils of a water animal or plant are found in a place then that place used to be covered by water in the past.

Fact 2: Most fossils are formed when sediment is deposited by wind or water.

Given the two facts above, answer the question "What type of material is a fossil formed?" with the following options: 
- shells
 - coral reefs
 - In ice
 - On a leaf
 - unique
 - segmented
 - On grass
 - In sediment


 

        In sediment 