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How Things Interact By: Christine Johnson Jasmine Lau

Table of Contents Why Is There Weather? -- 1 What Is The Atmosphere? – 2 Convection? -- 3 What Causes the Current Of Air To Move? -- 4 Where Did Ocean Currents Come From? -- 5 What Is The Difference Between High and Low Pressure? -- 6 What Are The Four Types Of Fronts? -- 7 Where Do Hurricanes Usually Form? -- 8 What Happens In A Tornado? -- 9 The Sun and The Sun’s Energy-- 10 What’s The Difference Between Isotherm and Isobar? -- 10 How Do Clouds “Precipitate”? -- 11 What Are The Different Types Of Clouds? -- 13 What Is A Dew Point? -- 14 How Scientists Get Images -- 15 Metrological Instruments Used By Scientists -- 16

Cool air


warm stationary


Precipitation is any type of water that forms in the Earth's atmosphere and then drops onto the surface of the Earth. Water vapor, droplets of water suspended in the air, builds up in the Earth's atmosphere. Water vapor in the atmosphere is visible as clouds and fog. Water vapor collects with other materials, such as dust, in clouds. Clouds eventually get too full of water vapor, and the precipitation turns into a liquid (rain) or a solid (snow).

Precipitation is part of the water cycle. Precipitation falls to the ground as snow and rain. It eventually evaporates and rises back into the atmosphere as a gas. In clouds, it turns back into liquid or solid water, and it falls to Earth again. People rely on precipitation for fresh water to drink, bathe, and irrigate crops for food. The most common types of precipitation are rain, hail, and snow.

Cirrus Clouds

Cirrus, cirrostratus, and cirrocumulus are made up of ice crystals.

Cumulonimbus Clouds

Thunderstorms come from cumulonimbus clouds. For this reason cumulonimbus clouds are also called thunderheads.

A cloud is a large collection of very tiny droplets of water or ice crystals. The droplets are so small and light that they can float in the air.

Cumulus Clouds

Cumulus clouds are usually a sign of fair weather. All air contains water, but near the ground it is usually in Nimbostratus the form of an invisible gas called water vapor. When Clouds warm air rises, it expands and cools. Cool air can't hold Nimbostratus as much water vapor as warm air, so some of the vapor condenses onto tiny pieces of dust that are floating in clouds may the air and forms a tiny droplet around each dust produce rain or particle. When billions of these droplets come together snow. they become a visible cloud.

Period 2, Jasmine&Christine, How Things Interact  

Book for fourth graders.

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