Across
- 2. Existing in or caused by nature; not made by human
- 3. The planet we live on
- 5. A mountain that shoots out hot lava and ash
- 6. Frozen water that is melting due to global warming
- 7. A connected system, like a food web in nature
- 9. All the plants, animals, and things not made by people
- 11. Plants in forests are often used to make this to cure sickness
Down
- 1. A big plant with leaves and wood that produces oxygen
- 4. To turn waste materials into new products
- 8. The gas in the air that humans need to breathe
- 10. Water that falls from the clouds