Across
- 3. The name given to gasses that trap heat and cause global warming.
- 5. A tool used to illustrate how much impact a human being has on the Earth.
- 6. The most toxic greenhouse gas emission. It is common around landfills and farms.
- 8. The most abundant element in the universe. It can be used as a fuel source.
- 10. energy Energy that can be used and reused an infinite number of times.
- 11. The most efficient form of transportation in terms of energy usage. It does not pollute.
Down
- 1. These plentiful and useful organisms consume carbon dioxide, convert it to food, and produce oxygen.
- 2. The most abundant energy source capable of being harnessed by humans.
- 4. Living within the limits of earth’s natural resources.
- 7. An interdependent community of organisms including plants, animals, water, air and the ground.
- 9. The part of the earth’s atmosphere that repels the sun’s ultraviolet rays.