Across
- 2. A single tree produces enough air to supply how many people for a year
- 4. Fifth largest planet in the solar system
- 5. Material that takes hundreds of years to decompose and is a major pollutant
- 7. Chichen Itza, one of the New Seven Wonders of the World, is found in what country?
Down
- 1. Marine animals that are especially threatened by ocean plastic
- 3. Term for materials that can be used again after processing
- 6. Most eco-friendly energy source