6th grade ch. 2 sec. 3 windsPresentation Transcript
Ch. 2 Sec. 3 Winds
horizontal movement of air from an area of high pressure area of lower pressure
caused by differences in air pressure
anemometer - wind speed
wind vane = wind direction
name of wind tells you where wind is coming from
ex. west wind blows east
increased cooling that a wind can cause
The wind chill factor is: -3° A 25° day with a wind speed of 20 miles per hour will feel like a -3° day.
winds that blow over short distances
caused by unequal heating of Earth’s surfaces within a small area
wind that blows from an ocean or lake onto land
flow of air from land to body of water
sea & land breezes over a large region that change direction with the seasons
Winds that blow steadily from specific directions over long distances
Created by unequal heating of Earth’s surface
Produced by movement of air between equator & poles
way Earth’s rotation makes winds curve
Coriolis Effect The Earth spins on its axis, which affects the direction of the wind. In the Northern hemisphere winds are swung to the right, and in the Southern to the left.
Global wind belts
Examples of Global winds:
Polar Easterlies: From 60-90 degrees latitude
Prevailing Westerlies: From 30-60 degrees latitude (aka Westerlies)
Tropical Easterlies: From 0-30 degrees latitude (aka Trade Winds)
Calm areas produced by Coriolis effect:
little or no wind
2. horse latitudes-
latitudes 30 degrees N & S of equator
Major global wind belts are:
1. Trade winds (easterlies)
blow from horse latitudes toward equator
2. Prevailing westerlies
blow toward poles - away from horse latitudes
blow from west east
3. Polar easterlies
blow away from poles
bands of high speed winds
about 10 km above Earth’s surface
blow from west east
affect airplanes’ fuel & flying time
Aircraft often try to use the quick jet stream flow to save fuel on, and hasten, eastbound flights: for example if you were to fly from Los Angeles to New York. However, turbulence is often associated with the regions around the jet stream so it can be a bumpy ride at times!
Jet stream roars along high above earth
Make a wind vane YOU NEED: 1 straw 1 straight pin 1 index card pencil with eraser tape DO THIS: 1. Cut the point and tail of an arrow out of an index card. 2. Tape them onto the ends of the straw. 3. Push the pin through the middle of the straw. 4. Stick the pin into the eraser of the pencil. Make sure the straw can turn freely.
Make an anemometer
5 three ounce paper Dixie Cups
sharp pencil with an eraser
1. Take four of the Dixie Cups and use the paper punch to punch one hole in each, about a half inch below the rim.
Take the fifth cup and punch four equally spaced holes about a quarter inch below the rim. Then punch a hole in the center of the bottom of the cup.
Take one of the four cups and push a soda straw through the hole. Fold the end of the straw and staple it to the side of the cup across from the hole. Repeat this procedure for another one-hole cup and the second straw.
Slide one cup and straw assembly through two opposite holes in the cup with four holes. Push another one-hole cup onto the end of the straw just pushed through the four-hole cup.
Bend the straw and staple it to the one-hole cup, making certain that the cup faces the opposite direction from the first cup. Repeat this procedure using the other cup and straw assembly and the remaining one-hole cup.
Align the four cups so that their open ends face in the same direction either clockwise or counter-clockwise around the center cup.
Push the straight pin through the two straws where they intersect.
Push the eraser end of the pencil through the bottom hole in the center cup. Push the pin into the end of the pencil eraser as far as it will go.