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