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fossil
Decayed plant and animal matter.
humus
The Topsoil
crude oil
HUmus
Duff
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.
Scavengers eat dead or decayed matter.
fuel is the decayed remains of plant and animal matter after thousands of years. hence the name: fossil fuels.
compost
The organic matter in soil is called humus.