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

Fact 2: Burial of sediments also causes the sediments to increase in temperature.

Given the two facts above, answer the question "oil is formed by burial of decomposing algae being pushed down which increases what" with the following options: 
- volcanic activity
 - Greenhouse gases
 - ocean acidity
 - kinetic energy
 - sea currents
 - Pollution
 - nutrients
 - temperatures


 

        temperatures 