Which option is a natural material that is not a fossil fuel?
A. Natural gas
B. Petroleum
C. Vinyl
D. Cotton
D. Cotton
Cotton is a natural fiber derived from the cotton plant. It is not a fossil fuel, unlike natural gas and petroleum, which are both carbon-based energy sources formed from the decayed organic matter of prehistoric plants and animals over millions of years. Vinyl is a synthetic plastic material (polyvinyl chloride or PVC), also not a fossil fuel, but it is not naturally occurring and often is produced from petrochemicals.