Transcript Wind PPT. 2x

Wind
By:
Daisy Mele
Melanie Cook
Ashley Mordue
Launie Moeai
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.
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.
• 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.
Main Ideas
1. 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.
1. 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.
2. Experts estimated that if people could use only 10
percent of the winds energy, it would far exceed the
worlds demand.
4. 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.
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.
•
•
•
•
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.
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(:
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