Renewable and Non Renewable Energy

4. Energy released from plants (wood, corn, etc.) through combustion or other chemical process.
7. An energy system is made up of a sequence of conversions with inputs and outputs that transform an energy resource into a form usable for human work or heating.
10. Resources, such as fossil fuels, that cannot be replaced by natural processes at the same rate it is consumed.
12. Energy transferred with the motion of air in the lower atmosphere that arises from differential heating of the Earth. The energy in the wind can be extracted as mechanical energy to do work such as grind grains (a wind mill) or generate electricity (wind turbine).

1. Energy from the sun; often captured directly as heat or as electricity through a photovoltaic process.
2. A chemical process that releases electrons from a semi-conductor material in the presence of sunlight to generate electricity.
3. An element that releases heat as it undergoes radioactive decay.
5. A non-renewable energy resource that began to form millions of years ago from the remains of once living plants and animals. Its current forms include petroleum, coal and natural gas.
6. Heat energy from the Earth.
8. energy Resources, such as wind and water, that can be recycled or replaced at a rate faster than they are consumed.
9. Transformation of the energy stored in a depth of water into electricity.
11. The point at which the rate that a non-renewable resource (oil) can be produced declines due to the limitations of extraction processes and the availability of the resource.