Across
- 5. All the life on Earth
- 7. Something that is changed in an experiment
- 9. All the water on Earth
- 11. Meteors burn up in this level
- 12. This is the last layer of the atmosphere
- 13. Water released from clouds in the form of rain, snow, or hail
- 14. The gases surrounding Earth
- 15. The result of the changing
Down
- 1. Most planes reach to this layer
- 2. The variable that stays the same
- 3. Cold air replacing warm air
- 4. Warm air pushes into cold air, causing weather
- 6. All the rocks and mountains on Earth
- 8. This level contains the ozone layer
- 10. This is the hottest part of the atmosphere
- 16. The weight of air pushing down