Those are called fossil fuels.
The uppermost layer of the soil which is the O-horizon, and is called "Humus".
Rocks that contain preserved plant and animal remains are called fossils. Fossils can provide valuable information about past life forms and environments on Earth. They are typically formed through the process of mineralization, where the remains are gradually replaced by minerals in the surrounding rock.
Fossil fuel.
Is natural gas formed by animal or plant remains
Sedimentary.
Coal.
sedimentary rock
coal
It is called humus.humus
It is called humus.humus
Sedimentary rocks formed from the remains of plants and animals are called organic sedimentary rocks. Examples include coal, formed from the remains of plants, and limestone, formed from the shells of marine organisms.