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Directions on How to Use the Flashcards 1. Print the cards, and paste the pictures on the back of the vocabulary cards. 2. After you paste the pictures on the back of the cards, cut the cards out. 3. Try to match the vocabulary word with the correct definition. You will know if you’re correct if the pictures match up. *The vocabulary terms and their definitions were taken from Prentice Hall: Science Explorer Air Mass A huge body of air that has similar temperature, pressure, and humidity throughout. Tropical A warm air mass that forms in the tropics and has low air Pressure. Polar A cold air mass that forms north of 50 degrees north latitude or south of 50 degrees south latitude and has high air pressure. Maritime A humid air mass that forms over oceans. Continental Front A dry air mass that forms over land. The area where air masses meet and don’t mix. Occluded Cut off, as warm air mass at an occluded front is cut off from the ground by cooler air beneath it. Cyclone A swirling center of low pressure. Anticyclone A high pressure center of dry air. Storm A violent disturbance in the atmosphere. Lightning A sudden spark, or energy discharge, caused when electrical charges jump between parts of a cloud or between a cloud and the ground. Tornado A rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud to touch Earth’s surface, usually leaving a destructive Hurricane Storm Surge Evacuate Flash Flood A tropical storm that has winds of 119 kilometers per hour or higher; typically about 600 kilometers across. A dome of water that swoops across the coast where a hurricane lands. To move away temporarily. A sudden, violent flood that occurs within a few hours, or even minutes of a heavy rain storm. Meteorologist Scientists who study the causes of weather and try to predict it. El Nino An event that occurs every 2-7 years in the Pacific Ocean, during which winds shift and push warm surface water toward the coast of South America; it can cause dramatic climate changes. Isobar Lines on a map joining places that have the same air pressure. Isotherm Lines on a map joining places that have the same air temperature.