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Chapter 4 Weather Extra Credit Crossword 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Across Down 4. The change of state from a gas to a liquid. 6. A warm air mass that forms in the tropics and has low air pressure. 7. Fluffy, white clouds, usually with flat bottoms, that look like rounded piles of cotton. 9. A swirling center of low air pressure. 15. Clouds that form in flat layers and often cover much of the sky. 16. A line on a weather map that joins places that have the same temperature. 18. Scientists who study the causes of weather and try to predict it. 19. A violent disturbance in the atmosphere. 21. A line on a weather map that joins places that have a same air pressure. 24. 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. 27. The process by which molecules at the surface of a liquid absorb enough energy to change to a gas. 29. The temperature at which condensation begins. 30. Wispy, feathery clouds made of ice crystals that form at high levels. 31. A long period of low precipitation. 32. Moving away temporarily from an area about to be affected by severe weather. 33. Bands of high-speed winds about 10 km above Earth’s surface. 1. The boundary where unlike air masses meet but do not mix. 2. A high-pressure center of dry air. 3. The percentage of water vapor in the air compared to the maximum amount of water vapor that air can contain at a particular temperature. 5. An overflowing of water in a normally dry area. 8. A small storm often accompanied by heavy precipitation and frequent thunder and lightning. 10. An instrument used to measure relative humidity. 11. A dry air mass that forms over land. 12. A rapidly whirling, funnel-shaped cloud that reaches down to touch Earth’s surface. 13. Any form of water that falls from clouds and reaches Earth’s surface as rain, snow, sleet or hail. 14. A huge body of air that has similar temperature, humidity, and air pressure at any given height. 17. A humid air mass that forms over oceans. 20. Cut off, as in a front where a warm air mass is caught between two cooler air masses. 22. A tropical storm that has winds of about 119 km/hr or higher. 23. The continual movement of water among Earth’s atmosphere, oceans, and land surface through evaporation, condensation, and precipitation. 25. The amount of water vapor in a given volume of air. 26. An instrument used to measure precipitation. 28. A cold air mass that forms north of 50⁰ north latitude or sound of 50⁰ south latitude and has high air pressure.