Across
- 1. NASA can communicate with astronauts above the ionosphere because the ionosphere does not reflect this
- 4. The rate at which solar energy enters the earth's atmosphere is called the ______________ constant.
- 6. In the carbon cycle, carbon is moved from the atmosphere into plants by this process
- 7. A region extending thousands of kilometers into space that includes the exosphere and Van Allen belts is called this
- 9. Most plants in the world depend on ______________ nitrogen produced by soil and marine bacteria
Down
- 2. Most of the direct solar energy that enters the earth is absorbed by this
- 3. most of the Earth's weather happens here
- 5. Evolutionists believe that the first life forms to appear would have been poisoned by the presence of this
- 8. Ozone in the atmosphere is made up of _______ oxygen atoms