Answer:
Fossil fuel
Step-by-step explanation:
Fossil fuels are obtained from dead and decomposed plants and animal remains left for centuries in the earth crust under pressure. These remains of organisms become covered with mud, silt and other sediments.
As the sediments pilled up under pressure, bacterial activity, heat and pressure changed these remains into natural gas and crude oil.
They are nonrenewable resources because the reserves could dry up with time as they are being used.