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Wind

Wind. By: Daisy Mele Melanie Cook Ashley Mordue Launie Moeai. What is Wind?.

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Wind

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  1. Wind By: Daisy Mele Melanie Cook Ashley Mordue Launie Moeai

  2. What is Wind? • Wind is the flow of air above earths surface. It’s main cause is when the sun unevenly heats the land/water. The heated air then rises and creates a pocket of low pressure underneath. From there cool air fills the space causing circulation. The flow of this air is known as wind.

  3. Wind Vocabulary • Atmosphere: the air surrounding the earth which is made up of different layers of gasses. Including the Troposphere, Stratosphere, Mesosphere, thermosphere and the Exosphere. • General Circulation: Circulation over the entire planet.

  4. Trade Winds: winds that blow from high pressure areas. It blows northeast in the northern hemisphere and southeast in the southern hemisphere. • Hadley Cells: create winds near the surface called trade winds. • Sypnotic-Scale Circulation: Air Motions around small regions of high and low atmosphere pressure.

  5. Main Ideas • When the sun shines it heats the land and air. The warm air is lighter than the cool air so it rises. Cool air fills its place, this movement of air causes the wind. • Air is wind. Wind is/can be blown so softly to the point where you can barely feel it, or it can be blown so hard to the point where it blows down buildings, makes tidal waves, and blows down heavy tree’s. • Experts estimated that if people could use only 10 percent of the winds energy, it would far exceed the worlds demand.

  6. People have used wind to do work for thousands of years. For an example the Egyptians used wind-powered sailing ships as early as 2800 B.C 5. The earth rotates from west to east. Wind bends to the right of the original direction in the northern hemisphere and bends to the left in the southern hemisphere.

  7. Wind Experiment • Question/Problem: What happens when hot and cold mix? • Hypothesis: The water would go in circles. • Materials: water, food coloring, jar, burner, ice cube • Procedures: First, we turned the heat on. Second, we poured the water. Third, we put the ice in. Fourth, we put the food coloring in and last we tested it.

  8. Controlled Variables: The food colors • Independent Variable: Burner • Dependent Variables: The ice • Data: When we put the water over the burner the food coloring went in circles. • Analysis: The coloring continued to go in circles until it fogged up. • Conclusion: Wind goes in circles depending on the temperature high and low.

  9. Question and Answer • Question: Which way does the wind blow in the northern hemisphere? A: Right • Question: Why does uneven heating of the atmosphere/water/land cause wind? A: The heat energy molecules move faster than the cool energy and it moves each other in a convection current(ex: a beach: warmer during the day, cooler at night water stays the same.) • Question: what did the Egyptians use wind power for? A: wind-powered-sailing(:

  10. Sources • Margaret A. LeMone. “Wind” World Book Encyclopedia 2007 ed. • Paul Fleisher. Gases, Pressure, and Wind USA: Lerner Publications Company, 2011 • Margaret A. LeMone “Wind” World Book Encyclopedia 2011 ed. Volume 21 page 329 • “Trade Winds.” The Oxford Companion in ships and the sea. 2006. Encyclopedia.com. October 12, 2011 http://www.encyclopedia.com • Westbroek, Glen. “Why Does the Wind Blow?” UEN. October 27, 2004. http://www.uen.org/core/science/sciber/sciber9/Stand_6/html/2c.htm

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