Dead Animals and plants?
crude oil
you are likely because it is organic matter formed from decayed plant and animal remain ,and is called humus.
The Rigolirh, the roots are found in the Bedrock.
it breaks down
Mold
Scavengers eat dead or decayed matter.
The sun. Oil is the product of decayed matter. The matter was originally plant and animal life which was supported by the sun's radiation.
compost
Humus
fossil
Decayed plant and animal matter.
Decayed organic matter
That would be necromass.
decayed organic matter
decayed organic matter
decayed organic matter
decayed plants and animals