Chapter 4.1- Earth’s

AtmospherePages 90-97

Earth’s Atmosphere Atmosphere- a thin

protective layer of air that surrounds the Earth and makes life possible

Atmospheric Gases: 78% Nitrogen, 21% Oxygen, 1% other gases

Solids: dust, salt, pollen Liquids: water

Troposphere Lowest layer Where I live Weather occurs here Contains 99% of the water

vapor found in the atmosphere & 75% of atmospheric gases

Extends 10 km above Earth’s surface (6.2 miles)

Higher you go the colder it gets

Stratosphere 10-50 km above Earth

(6 - 31 miles)

OZONE LAYER that protects us from sun’s UV rays is found here

Planes and jets fly here The higher you go the

warmer it gets because of the ozone layer

Mesosphere 50-85 km above Earth

(31 – 53 miles) Meteors burn up in this

layer b/c of friction with air particles (called shooting stars)

Temperature decrease as you go higher in the mesosphere (COLDEST LAYER)

Thermosphere thickest layer of the

atmosphere 85 - 500 km above the earth's surface (53 – 310 miles)

very high temperatures -90 - 2000C

auroras, northern lights Ionosphere – located

here, a layer of electrically charged gas particles which allows radio waves to travel across the country

Exosphere outermost layer of the

atmosphere 500 km - outer space (310 miles & beyond)

few molecules exist in exosphere and thermosphere they have extremely high energy & temps because 1st layer to receive the suns energy

space shuttle and satellites

so few molecules that the wings of the space shuttle are useless it uses rocket launchers

Jason-2 satellite carries tools & sensors to help study ocean.

“pauses” of the

atmosphere-boundaries of the layers

4 pauses that occur

AFTER that layer1.Tropopause2.Stratopause3.Mesopause

4.Thermopause

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Temperature Differences in the

AtmosphereThe layers of the atmosphere are

broken up based upon differences in temperature.

Let’s practice reading this graph…

1. What layer does the temperature reach -90oC

2. If you are at an altitude of 70km, what layer would you be in?

3. What layers does the temperature decrease with altitude?

4. What layers does the temperature increase with altitude?

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