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Air and Weather Text pg. D10-D17 V. Martinez 1. An air mass has the same general properties as the area over which it forms. 2. An air mass is a huge body of air which all has the same temperature and moisture. 3. Moist air masses form over water. 4. An air mass that forms near the equator is warm. 5. An air mass that forms over the Gulf of Mexico would most likely be warm and moist. 6. The green house effect is when the earth’s atmosphere traps heat near the Earth’s surface. 7. A front is the border where two air masses meet and where weather happens. 8. A warm front forms when a warm air mass catches up to a cold air mass. The warm air mass is moving faster. 9. A cold front forms when a cold air mass catches up to a warm air mass. The cold air mass is moving faster. 10. Cirrus clouds are very wispy white clouds. They form at high altitudes. They usually have ice crystals. 11. Cumulonimbus clouds are towering white gray clouds. They usually mean it will rain soon. 12. Cumulus clouds are puffy, cotton ball clouds. We see them on clear, warm, days. 13. Stratus clouds form a low layer of dark gray. They occur along warm fronts. Sometimes they bring light showers. 14. How does wind speed change as a weather front moves into an area? • Wind speed often increases as a weather front moves into an area. 15. What happens to air pressure as a front moves into an area? • Air pressure drops as a front moves into an area. 16. Does air temperature increase or decrease as a cold front moves into an area? • Air temperature decreases as a cold front moves into an area. 17. A line with half circles on a weather map is a symbol for a warm front. The circles point in the direction the front is moving. 18. A line with triangles is the symbol for a cold front. The air is colder BEHIND the cold front.