2.  Any natural substance, organisms, or energy form that living things use  Examples: Tree, Water, Wind, Natural Gas, Solar Energy.

3.  A resource that can be replaced in a lifetime.  Example: Trees, Water, Sunlight, Wind.

4.  Resources that will not replace themselves in a lifetime.  Coal,oil,

5.  Recycling is when you use discarded or used materials are treated and then used again.  Plastic, glass, paper, and aluminum.

6.  Natural resources that humans use to produce energy.  Different types like nonrenewable and renewable resources.  Ex. Natural gas, solar energy, and Hydro energy.

7.  Fuels that are made from the remains of animals millions of years ago.  Coal, and natural gas.

8.  An oily mixture of flammable organic compounds from which liquid fossil fuels.

9.  Gaseous fossil fuels.  Most natural gas is used for heating and for generating electricity.

10.  A solid fossil fuel formed underground from buried, decomposed plan material.

11.  A process in which rock and soil are stripped from the Earth’s surface to expose materials to be mined.

12.  Rain or snow that has high acid content

13.  A photochemical fog produced by the reaction of sunlight and air pollutants

14.  An alternative source of energy that comes from nuclei of atoms.

15.  Energy from the sun.

16.  Energy in wind.

17.  Produced by falling or running water

18.  Organic Matter that contains energy

19.  Energy from within the Earth