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Name ___________________________ HR __________ Block ______ Air Masses (Use the reading passage to help you complete the cloze passage.) An air mass is a __________________________________ that moves across the Earth. The air mass has a similar __________________ and amount of _____________________ . It has the same properties as the areas over which it forms. For example, an air mass that formed over the ocean near the equator would be ____________________________ (temperature) and ____________________________ (amount of water vapor). There are four main types of air masses. The air masses that form over water near the poles are called _______________________________ and have ___________________ air with _____________________ temperatures. The air masses that form over land near the poles are called __________________________________________ and have _____________ air with _________________ temperatures. The air masses that form over the warm ocean near the equator are called _________________________________________ . The air masses that form over land near the equator or over deserts are called __________________________________________________ and have ___________________________ temperatures and ____________________________ air. Air masses are moved around the earth by ___________________! Wind is caused by uneven ___________________________________ and _______________________________________________ . Word bank (some words will be used more than once) : maritime tropical maritime polar temperature Earth’s rotation dry moist huge body continental tropical continental polar warm cold heating of Earth moisture wind Bonus: Remember, areas of ______________________ pressure move toward areas of _________________ pressure.
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