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Wind
Chapter 6 Lesson 2
WHAT IS WIND?
 Air moves from areas of high
pressure to areas of low
pressure. This movement of air
is the wind
 A global wind moves steadily
over long distances in
predictable directions

Winds that blow between 30*N
and 30*S became known as trade
winds
 The particles in cold air
are more dense than the
particles in warm air.
 Cold air sinks and
warm air rises
What are local winds?
Sea Breeze
 The sun warms up the land and the
sea. The temperature of the land
increases faster than the temperature
of the water
 Air over the land becomes warmer
than air over the sea. The warm air
over the land becomes less dense and
the warm air rises
 The cooler, more dense air over the
ocean moves toward the warmer air
over the land.
 If you are visiting the beach, you
feel the wind blowing from the
ocean to the land= sea breeze
Land Breeze
 As night falls, the land and the
water both begin to cool. Land
cools faster than water, so the
air over the water stays
warmer=lower density
 The air over the water rises,
and cooler, higher
density/pressure air over the
land moves toward the water

If you are on the beach in the
evening, you may feel the wind
blowing from the land toward
the ocean
How is wind measured?
 Winds are described by
their direction and
speed
Wind Sock is another tool
that measures wind direction
Weather Vane- an instrument that
shoes which way the wind is
blowing
Anemometer measures wind
speed using three or four cups
that rotate when the wind
blows