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Atmosphere The envelope of gases that surrounds the Earth Composed of:Nitrogen (78%) Oxygen (21%) Carbon Dioxide (0.04%) Water Vapor (0.5%) Other Gases
Layers of the AtmosphereThe Earth’s atmosphere is divided into five basic layers: Troposphere Stratosphere Mesosphere Thermosphere Exosphere
Air Pressure/Air ParticlesMost of the air particles in the atmosphere can be found in the troposphere Troposphere has high air pressure Thermosphere has few air particles and very low air pressure
Temperature Changes If Earth’s atmosphere is invisible, how can we divide it into different layers? We divide the atmosphere into different layers based upon changes in temperature
Troposphere Layer closest to the EarthContains most of the air particles because gravity pulls them down Only layer that has weather Layer in which we live
Stratosphere 10-50 Km above the EarthContains the “Ozone Layer”- protects us from the sun’s UV rays Airplanes prefer to fly here Temperature rises slowly as you go higher
Mesopshere 50-85 Km Temperatures drop greatly in this layerColdest temperatures in the atmosphere Contains a layer of charged particles called the “ionosphere”- This allows radio/tv signals to work
Thermosphere Over 85-300 Km above the EarthThinnest layer- particles very spread out Temperatures rise as you go higher- hottest layer Where the Northern Lights occur
Aurora Borealis (Northern Lights)
Exosphere Over 300 Km above Earth Beginning of outer spaceWhere satellites fly
Earth’s Atmosphere Why is it so important to life on earth?
The surrounding air of the Earth
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