Download A Drop Around the World by Barbara Shaw McKinney PDF

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By Barbara Shaw McKinney

This ebook is a year-after-year favourite with lecturers. It engagingly leads readers world wide following a drop of water - no matter if as steam or snow, inside of a plant or animal, or underground - educating the wonders and value of the water cycle. (There is a lot of geography, too.) 4 pages of technology concerning the features of water are incorporated.

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Extra info for A Drop Around the World

Example text

Here’s how they work together: Vanishing Vapor Heat makes water molecules dance—the hotter the temperature, the faster they move. The faster they move, the more molecules bounce out of their drops as invisible water vapor. This flight of airborne water vapor is called evaporation. ), the water molecules boil, bumping each other wildly into thin air. Condensing Cold Cooler temperature slows them down again and the molecules condense to a liquid— as rain, dew, or drops on the side of your cold glass.

Water often travels far in underground streams. Eventually, rivers and streams bring it back to its source, the ocean, where currents carry it from sea to sea. The whole world is its playground. Transformation tricks Water teams up with temperature to perform the most amazing tricks! Here’s how they work together: Vanishing Vapor Heat makes water molecules dance—the hotter the temperature, the faster they move. The faster they move, the more molecules bounce out of their drops as invisible water vapor.

In all three states, but especially as a liquid, water helps to keep Earth’s temperature moderate. Unlike land, which heats up quickly in the sun but cools off just as fast at night, water absorbs the sun’s heat slowly and stores it for a long time before returning it to the air. During the daytime, the oceans, rivers, and lakes absorb the sun’s heat slowly, so it’s not too hot. At night, they give heat back to the air, little by little, so it’s usually not too cold for living things. As a gas, water further protects us with clouds of water vapor that both shield Earth from the daytime sun and hold heat in like a nighttime blanket.

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