2 Characteristics of the Atmosphere The Atmosphere is a mixture of gases that surround the earthThe Atmosphere protects us from the harmful rays of the sun.
3 Composition of the Atmosphere Besides the main two gases Nitrogen and Oxygen, the atmosphere also contains liquids and small solidsThe most common of the liquids in the atmosphere is water.
4 Atmospheric PressureAir pressure is the measure of the force with which the air molecules push on a surfaceAs you move farther from the earth the air pressure decreases
5 PressureThe Atmosphere is held in its position by the gravity of the earthGravity pulls the gas molecules towards the earth which gives them weightAs you move farther from the earth the air pressure decreasesAltitude is the height of an object above the earths surface
6 Air TemperatureAs you pass through the atmosphere, air temperature changes to warmer or colder conditions
7 Layers of the Atmosphere The Earth’s atmosphere is divided into five layers- the troposphere , the stratosphere, the mesosphere, the thermosphere, and the exosphere
8 Troposphere the layer of the atmosphere nearest Earth’s surface where all weather occurstemperature is warmest near the ground and decreases as you go higher, (as altitude increases, temperature decreases )
9 Stratosphere Is very thin and contains little moisture Is extremely cold (-60 degrees Celsius)The ozone layer which absorbs the harmful rays of sunlight is found hereJets fly here
10 Mesosphere Is the coldest layer of the atmosphere (-93° C) Meteors burn up in this layer
11 Thermosphere Temperatures can reach 2,000 degrees Celsius The temperature here is dependent on solar activity.Auroras occur in this layer
12 ExosphereDifferent regions of this layer make long distance communication possibleSatellites found here
13 A way to remember the layers of Earth’s Atmosphere! TroposphereStratosphereMesosphereThermosphereExosphereThat Snail Missed The Exit!