Fact 1: Fossil fuels are formed from dead organisms over time.

Fact 2: Like coal, petroleum is a fossil fuel.

Given the two facts above, answer the question "Which of these is formed from dead organisms over time?" with the following options: 
- Soil
 - Granite
 - coral
 - Coal
 - potash
 - ferns
 - oil
 - Rust


 

    Coal     