Search Results for: Residues resulting from treatment of animal
recently and from the metabolic by-products of living organisms. they include wood, vegetable oils , animal fats , and animal manure. by contrast, fossil fuels , such as coal and petroleum , are derived from long-dead biological materials that have been transformed by geological processes. in principle
recently living organisms . this includes materials from plants and animals and their by-products. for example, manure, garden waste and crop residues are all sources of biomass. it is a renewable energy source based on the carbon cycle , unlike other natural resources such as petroleum , coal , and...
https://www.newworldencyclopedia.org/entry/Biofuel