Across
- 2. where the atmosphere begins to heat up again
- 4. forms the outer edge of the atmosphere and blends into outer space
- 7. lies above the troposphere
- 9. thin layer above stratosphere where temp grows colder with increasing height
- 10. downward force that is exerted by the air
Down
- 1. layer closest to the earth's surface. Dense
- 3. absorbs UV rays from the sun
- 5. blanket of gases that surrounds earth
- 6. instrument used to measure day to day changes in air pressure
- 8. molecule containing 3 atomwz of oxygen.
- 11. substance or material that is harmful to the ecosystem and living things