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Across 1. an instrument used to measure relative humidity 6. the horizontal movement of air from an area of high pressure to an area of lower pressure 8. the prcess by wich heat is trapped in the atmosphere by gases that form a "blanket" around Earth (2 words) 9. a form of oxygen that has three oxygen atoms in each molecule instead of the usual two 10. the process by which molecules of water vaper in the air turn to liquid water 11. wispy, feathery clouds made of ice crystals that form at high levels 16. a high-pressure center of dry air 17. the temperature at which condensation begins (2 words) 18. rain that contains more acid than normal (2 words) 23. an instrument used to measure wind speed 25. a rapidly whirling, funnel-shaped cloud that reaches down to touch Earth's surface 26. a tropical storm that has winds of about 119 kilometers per hour or higher 27. an instrument used to measure air pressure

Down 2. the circulation of a fluid as it alternately heats up and cools down (2 words) 3. an instrument used to measure temperature 4. a small storm often accompanied by heavy precipitation and frequent thunder and lightning 5. any form of water that falls from clouds and reaches Earth,s surface 7. an instrument used to measure precipitation (2 words) 12. long periods of low precipitation 13. the amount of water vaper in a given volume of air 14. a sudden spark or energy discharge, caused when electrical charges jump between parts of a cloud,between nearby clouds, or between a cloud and the ground 15. the transfer of thermal energy by the movement of a fluid 19. a swirling center of low air pressure 20. the amount of mass of a substance in a given volume 21. the envelope of gases that surrounds Earth 22. the condition of Earth's atmosphere at a particular time and place 24. the average, year-after-year conditions of temperature, precipitation, wind, and clouds in an area