Across
- 4. the gaseous substance we breathe
- 7. a big land form that rises way above its surrounding land
- 8. to change waste into reusable material
- 10. a huge body of saltwater that covers much of the Earth's surface
- 11. an area of land that has many trees
- 12. an area of deep, fresh water that is enclosed by land
Down
- 1. a living thing that grows in the soil
- 2. a living creature other than a human
- 3. a large area of grassland
- 5. a sandy, barren area of land that receives little rain
- 6. a large star that warms the Earth
- 9. the 3rd planet from the sun