The great majority of asphalt used commercially is obtained from petroleum. Nonetheless, large amounts of asphalt occur in concentrated form in nature. Naturally occurring deposits of asphalt/bitumen are formed from the remains of ancient, microscopic algae (diatoms) and other once-living things. These remains were deposited in the mud on the bottom of the ocean or lake where the organisms lived. Under the heat (above 50 °C) and pressure of burial deep in the earth, the remains were transformed into materials such as asphalt/bitumen, kerogen, or petroleum.
The great majority of asphalt used commercially is obtained from petroleum . Nonetheless , large amounts of asphalt occur in concentrated form in nature . Naturally occurring deposits of asphalt / bitumen are formed from the remains of ancient , microscopic algae ( diatoms ) and other once - living things . These remains were deposited in the mud on the bottom of the ocean or lake where the organisms lived . Under the heat ( above 50 ° C ) and pressure of burial deep in the earth , the remains were transformed into materials such as asphalt / bitumen , kerogen , or petroleum .
What other product of heat and pressure does the formation of asphalt and petroleum  produce?
What other product of heat and pressure does the formation of asphalt and petroleum produce ?
kerogen
kerogen