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The Atmosphere and Weather Factors Study Guide 80 point Test – Wednesday, February 16th The Atmosphere (Chapter 1) atmosphere – the layer of gases surrounding Earth barometer – instrument used to measure air pressure pressure – a push or a pull density – How heavy (mass) something is for its size (volume). formula for finding density - mass/volume (Air has mass.) altitude (elevation ) – basis for classifying the layers of the atmosphere Earth’s atmosphere is made up of nitrogen (78%), oxygen (21%), carbon dioxide, water vapor, and many other gases, as well as particles of liquids and solids. Air pressure decreases as altitude (height or elevation) increases. As the temperature of air decreases (cools), its mass increases. Use your STUDENT CREATED study guide to know the names and characteristics (including ionosphere and exosphere) of the atmospheric layers. You should also recognize the altitude of each layer. Focus on the order of the layers; do NOT memorize specific altitudes. Weather Factors (Chapter 2) Reread, study, and review the section 2-1, 2-2, and 2-3 section summaries. The review and reinforce pages are great for having someone quiz you on the bold terms. Place extra emphasis on understanding the differences between (2-2) conduction, convection, and radiation as well as contrasting land and sea breezes (2-3). Cloud formation – Clouds form when water vapor in the air becomes liquid water or ice crystals. Precipitation – any form of water (rain, freezing rain, sleet, hail, snow) falling from clouds.