Across
- 4. nonrenewable energy sources like coal, oil, and natural gas that are formed from ancient plants and animals
- 5. a change in the Earth’s climate through global warming
- 6. a substance that pollutes either the water or atmosphere
- 8. capable of being broken down especially into innocuous products by the action of living things
- 10. a gas made of only three oxygen atoms
- 11. a transparent liquid that is usually room temperature
- 12. the upper layer of earth that may be dug or plowed and in which plants grow
- 13. discarded waste, or trash, that has been left in an inappropriate place
Down
- 1. increase in the average temperature of the Earth
- 2. of, derived from, relating to, or caused by the sun
- 3. atmospheric molecules that trap heat by absorbing infrared radiation emitted by the Earth
- 7. a source of energy that is not depleted by use, such as water, wind, or solar power
- 9. a number of different species in a certain area or ecosystem