Transcript Land and Sea Breezes - Atlanta Public Schools

LAND & SEA BREEZES
6th Grade Science
Land and Sea
Breezes
WIND
• Wind is the horizontal
movement of air from an
area of high pressure to
lower pressure.
Two types of winds
Local Winds
- are the winds that
blow over short
distances.
Global Winds
- are the winds that
blow steadily from
specific directions
over long distances.
WIND
• It is caused by:
– 1.Differences in temperature.
– 2.Differences in pressure.
DIFFERENCES IN TEMPERATURE
• 1. Warm air rises.
– Warming air make the
molecules move faster
and spread out.
– This makes the air less
dense.
– Less dense air is light
and will rise.
Differences in Temperature
• 2. Cold air sinks.
– Cooling air makes the
molecules move slower
and group together.
– This makes the air
more dense.
– More dense air will
sink.
Balloon
DIFFERENCES IN PRESSURE
• 1. Rising air creates Low pressure.
– If air is lifted up, that means there is Less air
pushing down on Earth.
• 2. Sinking air creates High pressure.
– If air is sinking, then air is pushing down on
the surface of Earth with a High amount of
pressure.
The Creation of Wind
• 1. Differences in temperature cause air to rise
and sink all over Earth’s surface.
• 2. Rising and sinking air creates high and low
pressure.
• 3. The atmosphere does NOT like
UNBALANCED PRESSURE SOOOO…
• IT TRIES TO EQUAL OUT PRESSURE BY
MOVING AIR FROM HIGH TO LOW PRESSURE.
Winds are created by …
• 1. Heating the air, decreases pressure (warm air rises creating
a low pressure area).
• 2. Cool air rushes in to replace the warm air (cooler, denser,
air produces high pressure).
• 3. As air goes from high pressure to low pressure, winds form.
• 4. Wind is a horizontal movement of air.
• 5.There are 2 types of winds: local & global.
SEA BREEZE… Air moves from
the sea during the day.
LAnd BREEZE… air moves
from the land at night.
Convection
Convection is the main way the atmosphere is
heated.
Mr. Fetch’s Earth Science Classroom
Land & Sea Breezes
u-tube
• http://www.authorstream.com/Presentation
/griffinv3-269366-land-sea-breezes-earthheating-20and-20sea-20breezes-jheducation-ppt-powerpoint/