Layers of the atmosphere

air pressure

Air pressure is greatest near Earth's surface because the air molecules are closer together. This dense air exerts more force that the less dense air near the top of the atmosphere

How did Earth's atmosphere form?

As Earth cooled, volcanism started to occur and volcanic gasses created Earth's atmosphere

temperature and altitude from the stratosphere

As altitude increases, temperature increases . This is because of the high concentration of ozone in the stratosphere.

Stratosphere

Extends 15-50km above Earth, the ozone is found here and absorbs ultraviolet rays from the sun. Heats the stratosphere and protects us from radiation. Air temperature increase with height above Earth. very calm

Mesosphere

Extends 50-80km above earth, coldest layer(-90c) Air temperature decreases with height above Earth. Protects Earth - most meteoroids burn in this layer

Thermosphere

Extends 80-550km above Earth, temperature increase with height above Earth. Hottest layer because energy from the sun hits here first. It has changed atoms & molecules called the Ionosphere.

Exosphere

Outermost layer, extend from 550km into space, air is very thin, GPS satellites orbit the Earth here.

ozone layer

Protective layer in atmosphere that shields earth from UV radiation.

Which layer contains the Ozone?

Stratosphere

Photosynthesis

Takes in the carbon dioxide and releases O2 Earth's first organisms could then undergo photosynthesis, which changed the atmosphere. Photosynthesis uses light energy to produce sugar and oxygen from carbon dioxide and water. The organisms removed CO2 from the atmosphere and released oxygen into it. Eventually, the levels of CO2 and oxygen supported the development of other organisms.

Earth is surrounded by a blanket of air called the

atmosphere

The atmosphere is made up of a mixture of

gases

atmosphere

gases that surround the Earth held in place by gravity 78% nitrogen and 21% oxygen

As altitude increases, what happens to density?

it decreases

As altitude increases, what happens to pressure?

it decreases

Troposphere

lowest layer, extends from 0-15km above earth, clouds form and weather happens here, planes fly here, air temperature decreases with height above Earth

About three fourths of the atmosphere is made up of

nitrogen

auroa borealis

northern lights the thermosphere includes this

The ozone layer keeps most of the sun's harmful ______ from reaching Earth

radiation

The layer of the atmosphere closest to Earth is the

troposphere

Name all the layers of the atmosphere

troposphere, stratosphere, mesosphere, thermosphere, exosphere

Weather occurs in the troposphere

true