Fact 1: Oil is formed by layers of sediment pushing down on decomposing algae.

Fact 2: When the algae die they decompose.

Given the two facts above, answer the question "Oil is formed when sediment layers push on what sort of algae?" with the following options: 
- coral
 - living
 - rich
 - healthy
 - dead
 - life
 - fungi
 - peat


 

     dead    