Across
- 4. direct contact with an object
- 6. 21% of Earths air
- 7. total energy of the system
- 9. average energy of a system
- 10. blocks out harmful rays
Down
- 1. the planet we live on
- 2. the center of our solar system
- 3. where weather occurs
- 5. very spread out particles
- 8. occurs in the Thermosphere