Oil is formed by layers of sediment pushing down on decomposing algae, and fossil fuels like coal and oil are ancient biomass fuel. Given these facts, what is a product of layers of sediment pushing down on decomposing algae over time among the following options:
- Fungus
 - Greenhouse gases
 - Fossil fuels
 - Calcium carbonate
 - salinity
 - Sand
 - contamination
 - Water


 

   Fossil fuels      