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move across the entire planet
cover large areas
can not always feel them on the ground
blow at same speed and in the same direction
how can you measure wind
anemometer- measures how fast wind blows
wind vane- tells which direction the wind is going in
in which atmospheric layer does the temp. decrease as altitude increase
thin layer of air that protects the earth's surface from extreme temperature and harmful sun rays
molecules closer to the surface are now more densely packed then those higher in the atmosphere because of the mass of gases pressing down from higher in the atmosphere
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