are those that are always being replaced and will not run out
Renewable resources
are those that cannot be replaced quickly enough to keep from running out
Nonrenaewable resources
is the presence of substances that are harmful to the enviroment or to living things
pollution
is any fuel that formed form the remains of plants and animals that lived millons of years ago
fossil fuel
is electricity produced by the energy in moving water
Hydroelectric power
is plant material animal waste used as fuel
Biomass