Troposphere: Only layer to support life, Most weather occurs here (Tropos means change), 1st layer from Earth (5-9 miles thick), Stratosphere: 2nd layer from Earth (22 miles thick), Ozone layer found here, Strat means Layers - Cold, heavy bottom layerlayer, Mesosphere: Middle layer (3rd Layer from Earth), Lots of iron dust from meteors, Meteors burn up in this layer, Thermosphere: Hottest layer - 4,500 degrees F, 4th layer from earth (319 miles thick), ISS (International Space Station), Exosphere: Outermost layer of atmosphere (Exo means Outside), Least dense of all layers - No oxygen, Last layer before outer space6,200 miles thick, Ionosphere: Crosses the Mesosphere,Thermosphere, and Exosphere, Aurora Borealis (Northern Lights), Ions (electrical charged particles) are affected by the magnetic fields of both Earth and the sun,

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