The Atmosphere

5. Shimmering light in the night sky near the poles.
6. The transfer of thermal energy by the movement of a liquid or gas.
7. Means ball.
10. Means middle.
14. Means heaped, puffy.
16. Means layer.
17. The transfer of energy as heat through a material.
18. The layer of the atmosphere in which temperature increases as altitude increases.
20. Means heat.
21. Means turning.

1. A layer in the stratosphere that contains concentrations of a gas which blocks most ultraviolet radiation from the sun.
2. The lowest layer of the atmosphere.
3. Warming that results when solar radiation is trapped by the atmosphere.
4. The transfer of energy by electromagnetic waves.
8. Means curl of hair.
9. Cirrus clouds formed by the exhaust from jet engines.
10. The layer of the atmosphere between the stratosphere and the thermosphere.
11. Means precipitation.
12. A mixture of gases that surrounds a planet or moon.
13. The part of the thermosphere where electrically charged particles are found.
15. The most abundant gas in the atmosphere.
19. The measure of the force with which air molecules push on a surface.