2Today’s Objectives Students will be able to: Identify the layers of the Earth’s atmosphere.Describe the layers of the Earth’s atmosphere.Diagram and label the layers of the atmosphere with temperature and composition.
8Stratosphere – milesLower limit mixes with troposphere to form the jet stream (115+ mph)Air gets warmer with altitudeThis is called a temperature inversionThe Ozone layerWhy the inversion?
9Stratosphere – 10-30 miles The Ozone layer High concentration found around 15 miles highAbsorbs most of the Sun’s harmful ultraviolet rays.Absorption raises the temperatureThe Ozone layer
10Above 99.9% of total atmosphere Stratopause – 30 milesDivides stratosphere and mesosphereThe height temperature STOPS increasing.Temperature can reach 40ºF1 mb (millibar) of pressureAbove 99.9% of total atmosphere
12Mesosphere – milesAgain, temperature decreases as elevation increases.This is due to no ozone and molecules being far apartCan reach temperatures as low as -130ºFWhy?
13Mesopause – 50 miles Divides mesosphere and thermosphere The 2nd height at which the temperature stops decreasing.Temperature can reach ºF
14Protects us from meteors and obsolete satellites Thermosphere – milesthe “Hot Layer”Oxygen atoms absorb energetic solar rays, warming the airReaches around 2,700ºFProtects us from meteors and obsolete satellites
16Satellites and Space Shuttle fly Exosphere – 120+ milesUpper reaches of atmosphereSo little gravity that atoms are able to shoot off into spaceRange 570ºF to over 3,000ºFSatellites and Space Shuttle fly