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 32 33 31 Across Down 4. The change of state from a gas to a liquid. 1. The boundary where unlike air masses meet but do not mix. 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. 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. 19. A violent disturbance in the atmosphere. 12. A rapidly whirling, funnel-shaped cloud that reaches down to touch Earth’s surface. 21. A line on a weather map that joins places that have a same air pressure. 13. Any form of water that falls from clouds and reaches Earth’s surface as rain, snow, sleet or hail. 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. 14. A huge body of air that has similar temperature, humidity, and air pressure at any given height. 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. 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. 32. Moving away temporarily from an area about to be affected by severe weather. 25. The amount of water vapor in a given volume of air. 33. Bands of high-speed winds about 10 km above Earth’s surface. 28. A cold air mass that forms north of 50⁰ north latitude or sound of 50⁰ south latitude and has high air pressure. 26. An instrument used to measure precipitation.