Across
- 5. A cold, treeless, arctic region where the ground is always frozen
- 8. A measure of how far a place is from the equator
- 10. Relying on each other
- 11. A dense forest, usually in a tropical area, that receives a lot of rain and contains diverse animal and plant life
- 12. Relating to the environment or to concerns about how to protect the environment
- 14. The height of land above sea level
- 15. A description of the temperature, clouds, rain, wind, and other conditions in the air
Down
- 1. Relating to areas of a planet, star, or moon near the north or south pole
- 2. An important part that helps form a whole thing or a whole area
- 3. A change in an organism or species that allows it to better survive in its environment
- 4. Harmful material in the air, in water, or in the ground
- 6. All the living and non-living parts of Earth
- 7. To go into a state of deep sleep, often during winter
- 9. A forest in a part of the world with moderate temperatures
- 13. A flat grassland with few trees