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Across 6. The Layer of the atmosphere with the highest temperature. 9. The layer of the atmosphere that contains the most mass. 11. The transfer of energy that occurs when molecules collide. 12. The transfer of energy from a warmer substance to a cooler substance. 14. An increase of temperature with height in an atmospheric layer. (2 Words) 17. Transfer of energy through electromagnetic waves. 19. Term that describes a vapor or gas turning into a liquid. 20. When many cloud droplets combine to form a larger droplet. 21. The measurement of the speed of molecules movement. 22. The temperature to which air must be cooled to reach saturation. (2 Words)

Down 1. Gas formed by the addition of a oxygen atom to an oxygen molecule. 2. The height at which condensation occurs. (3 Words) 3. The highest layer of the atmosphere. 4. The formation of clouds when hot air is forced upward by wind pushing against a mountain. (2 Words) 5. Energy stored in water vapor (2 Words) 7. The amount of water vapor in the air. 8. Term that describes a liquid turning into a vapor or gas 10. The relation between the amount of water vapor in the air and the amount of water vapor the air can hold. (2 Words) 13. The layer of the atmosphere that contains ozone. 15. Term used to describe any form of water falling from a cloud. 16. The middle layer of the atmosphere. 18. The transfer of energy by the flow of a heated substance.