Across
- 3. Meteorites burn up in this layer.
- 9. The _______ effect is the warming of the earth.
- 12. Takes up about 21% of the air composition in the atmosphere.
- 13. A shell of gas around the earth.
- 15. Oxygen, nitrogen, and argon are the main ________ gases.
- 17. Occurs naturally within the earth's crust.
- 20. Ocean levels will _____ if ice caps melt.
- 21. Found all over the world and in every living thing.
- 22. The layer we currently live in.
- 24. Emitted by natural sources such as natural wetlands.
- 25. 78% of air composition.
- 26. The hottest layer in the atmosphere.
Down
- 1. The burning of what fuels is a major contribution to global warming
- 2. An effect of global warming is stronger _____.
- 4. The energy absorbed by the earth, which is one of the causes of global warming comes from what?
- 5. The amount of a particular gas in the air.
- 6. Cutting down ________ is a major contribution to global warming.
- 7. An example of fossil fuel is?
- 8. The stratosphere houses the what?
- 10. A type of wind that is found beyond the atmosphere.
- 11. This layer houses the ozone layer.
- 14. chemicals that destroy the ozone layer.
- 16. The main reason for an increase in greenhouse gas usage is _______ activity.
- 18. What layer is contained in the thermosphere?
- 19. The _____ and the sun are two major heat sources for the troposphere.
- 23. _____ rays are absorbed in the thermosphere.