those that are always being replaced and will not run out
Renewable resources
those that can’t be replaced quickly enough to keep from running out
Nonrenewable resources
the presence of substance that are harmful to the environment or to living things
Pollution
any fuel that formed from the remains of plant and animals that lived millions of years ago
Fossil Fuels
electricity produced by the energy in moving water
Hydroelectric Power
plant material and animal waste used as fuel
Biomass