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Across 3. The process of water changing from a liquid to a gas. 6. When cloud droplets collide they join together to form a larger droplet. 9. The outermost layer of Earth's atmosphere. 11. Above the stratopause 13. The temperature to which air must be cooled at constant pressure to reach saturation. 16. An increase in temperature with height in an atmospheric layer. 18. Includes all forms of water both liquid and solid that fall from clouds. 19. Stored energy. 20. Are small particles in the atmosphere around which cloud droplets are formed. 21. The transfer of energy by the flow of a heated substance. 22. Contains only a minute portion of the atmosphere's mass. 24. The transfer of energy that occurs when molecules collide. 25. The constant movement of water between the atmosphere and Earth's surface.

Down 1. A measurement of how rapidly or slowly molecules move around. 2. The height at which condensation occurs. 4. Layer closest to Earth's surface contains most of the mass of the atmosphere including water vapor. 5. The transfer of energy that occurs because of a difference in temperature between substances. 7. The method of cloud formation. 8. A layer made up primarily of concentrated ozone. 10. The amount of water vapor in the air. 12. The transfer of energy through space by visible light. 14. Occurs when matter changes state from a gas to a liquid. 15. The ability of an air mass to resist rising. 17. The ratio of water vapor in a volume of air relative to how much water vapor that volume of air is capable of holding. 23. A gas formed by the addition of a third oxygen atom to an oxygen molecule.