Across
- 2. atmospheric layer that filters out ultra violet rays
- 4. gas that makes up largest part of the atmosphere
- 6. boundary between the troposphere and stratosphere
- 7. found at the center of the earth
- 9. the lower part of the atmosphere
- 10. the water layer of the earth
Down
- 1. ______________ discontinuity
- 3. the crust layer of the earth
- 5. thickest layer of the earth’s crust
- 8. the outmost layer of the atmosphere