VOCABULARY
-Fossil fuels:Any combustible organic material, as oil, coal, or natural gas, derived from the remains of former life.
-Weak:Liable to give way under pressure or strain.
-Nut:A dry fruit made up of a kernel that may be eaten, and enclosed in a woody or leathery shell.
-Algae:Any of many groups of one-celled organisms containing chlorophyll and usually living in watery or damp environments.
