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

Fact 2: When algae dies, it uses oxygen to decompose.

Given the two facts above, answer the question "What is created when sediment mixes with dead algae?" with the following options: 
- Flowers
 - peat
 - bogs
 - lake
 - Lillypads
 - Water
 - Oil
 - moss


 

       Oil  