Across
- 7. To save or reduce the use of something.
- 8. Harmful substances in the air, water, or soil.
- 10. Resources that are being used up faster than they are made.
- 11. A renewable resource that comes from the heat from inside the Earth.
- 12. The energy released by a fission or fusion reaction; the binding energy of the atomic nucleus.
- 13. The energy received by Earth from the sun in the form of radiation.
- 14. The use of air flow through wind turbines to mechanically power generators.
- 15. Energy-rich substances formed from the remains of once living organisms
- 19. A gas that contributes to the greenhouse effect by absorbing infrared radiation, e.g., carbon dioxide and chlorofluorocarbons.
- 20. A change in global or regional climate patterns.
Down
- 1. Resources that are constantly being supplied.
- 2. Able to be maintained at a certain rate or level.
- 3. . The process of recovering valuable or useful materials from waste or scrap
- 4. A gradual increase in the temperature of Earth’s atmosphere.
- 5. Electricity produced by the kinetic energy of water moving over a waterfall or dam.
- 6. Any natural material that is used by humans, such as water, petroleum, minerals, forests, and animals.
- 9. A form of hydropower that converts the energy obtained from tides into useful forms of power
- 16. A renewable resource made from things that were once alive.
- 17. The chemical element of atomic number 92, a gray, dense radioactive metal used as a fuel in nuclear reactors.
- 18. The gas formed when carbon is burned, or when people or animals breathe out.