Download Winds - Helena Middle School

Wednesday 3/1/17
Notebook Entry: What do you think causes
wind?
Winds
Heating of Earth’s Surface
The angle of the sun's rays causes temperature differences
at Earth's surface. Which area on Earth receives the most direct
light from the sun, and which areas receive the least?
Winds
The Coriolis Effect
The Coriolis effect determines the direction of global winds.
What causes wind?
Unequal temperatures cause a
change in the density of air (air
pressure).
This causes the air particles to
move.
Cold air moves towards warm air.
Which absorbs heat faster? Water or land?
Land breeze vs. Lake/Sea breeze
 Animation
 What happened to the temperature of the
air above the ocean water in 24 hrs.?
 What happened to the temperature of the
air above the land in 24 hrs.
 Does temperature affect where the air moves
to?
Things to Remember
 Warm air is less dense that cold air causing
it to rise.
 Cold air will move in to take the place of
warm air.
 This creates the movement of air, aka Wind!
 Land heats up and cools down faster than
water.
Land Breeze vs. Sea Breeze Diagrams
 On your worksheet sketch a diagram to show how heat
transfer causes the wind
 Use colors and labels to show the types of heat transfer
radiation, convection, conduction