Download Earth`s Atmosphere

Unit 3 Earth’s Atmosphere
Big Idea: Earth’s
atmosphere is a mixture
of gases that interacts
with solar energy
Up and Away!
Unit 3 Lesson 1 The Atmosphere
What is Earth’s atmosphere?
• Atmosphere -mixture of
gases that surrounds Earth.
Functions of the Atmosphere
1. Protecting organisms from sun’s
damaging rays
2. Maintain the right temperature
range of life
3. Supplies gases necessary for
breathing
o 78% N
o 21% O2
o 1% other gases
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Unit 3 Lesson 1 The Atmosphere
Look Way Up
Layers of the atmosphere
• Thermosphere -temp
• Mesosphere –temp
as altitude
as altitude
• Stratosphere- temp as altitude
increases. Ozone absorbs UV
• Troposphere- temp as altitude
temp near the surface vary greatly,
contains 80 % of the atmosphere’s
total mass
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Unit 3 Lesson 1 The Atmosphere
Here Comes the Sun …
• Ozone layer area in the
stratosphere that
contains a high
concentration of ozone. It
absorbs most of the sun’s
radiation.
• Greenhouse effectprocess by which certain
gases in the atmosphere
absorb & give off infrared
radiation.
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Conduction- transfer of thermal energy by
collisions between particles in matter.
Convection-transfer of thermal energy in a
fluid by the movement of warmer and cooler
fluid from place to place.
Radiation-transfer of energy by
electromagnetic waves.
Unit 3 Lesson 3 Wind in the Atmosphere
What causes wind?
• Wind -movement of
air caused by
differences in air
pressure.
• Coriolis effect Earth rotates,
causing winds to be
deflected, or curved.
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Unit 3 Lesson 3 Wind in the Atmosphere
Feelin’ Breezy
• Local winds -movement of air over
short distances. They can blow from
any direction.
1. Sea breeze
2. Land breeze
3. Valley breeze
4. Mountain breeze
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/
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Unit 3 Lesson 3 Wind in the Atmosphere
• Global winds wind systems that
occur at or near Earth’s surface.
1. polar easterlies
2. westerlies
3. trade winds
4. Jet streams
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Unit 3 Lesson 3 Wind in the Atmosphere
4.Jet streams -narrow belts of highspeed winds that blow from west to
east, between 7 km & 16 km above
Earth’s surface.
• Subtropical
• Polar
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