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Latitude determines temperature Moisture determined by whether it forms over oceans or continents 12-7 What are air masses? Lesson Review PART A Write true if the statement is true. If the statement is false, change the underlined term to make the statement true. True 1. An air mass forms when air stays over an area for a while or ________ moves slowly over an area. __________ F- Dry 2. Air masses that form over land are moist. True __________ 3. Air masses that form over tropical regions are warm. F- Cold 4. Polar air masses form over warm regions. __________ True __________ 5. A warm air mass that forms over the Caribbean Sea is a maritime tropical air mass. ______________ F- Continental 6. Air masses that form over dry land are tropical air masses. PART B Identify the air masses shown on the map. Write your answer in the space with the same number as the box on the map. mP mP mT cP cT mT mP 1. _____________ cP 2. _____________ mP 3. ______________ mT 4. ______________ cT 5. ______________ mT 6. ______________ Skill Challenge Skills: classifying, identifying Complete the table. Land Water Water Land Cold Cold Warm Warm Cold Cold Warm Warm Dry Moist Moist Dry Fronts – boundary between air masses where precipitation is likely to occur Cold FrontWedge of cold air dry air (cP) pushes under a warm and humid air (mT). When the boundary passes, temps drop and pressure rises. Cold dry air is denser, so it wedges underneath the warm air and easily wins the battle. Cold fronts move quickly. Warm Front – A warm humid air mass (mT) tries to push over a cool drier air (cP or mP). When the boundary passes, temps rise and pressure falls. Warm air is less dense than cold air, so it cannot push the cold air out of the easily. It is forced up and over the cold air mass. Warm fronts move slowly. Stationary Front • A stationary front occurs when the air masses on either side of the front are not moving toward each other. Occluded Front: When a cold front catches up to a warm front. High Pressure System (Anti-Cyclone)- bring fair weather Clear (sunny) conditions, low chance of precipitation. Winds circulate clockwise and outward away from the center (N. Hemisphere) Low Pressure System (Cyclone)- bring cloudy & stormy weather Clouds and high chances of precipitation. Form along frontal boundaries. Wind circulates counter-clockwise and inward toward center. (N. Hemisphere)