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Published byHelena Park Modified over 8 years ago
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ATMOSPHERIC LAYERS
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TROPOSPHERE We live here! – (nearest Earth’s surface) Weather occurs here! Contains 80% of atmosphere’s mass – Airplanes require density to promote lift As altitude increases, temperature & air pressure decreases – Ex 1: top of mountain vs. sea level Temp. Variation creates air mass movement - (humidity, formations, etc…) Convection turns air over
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STRATOSPHERE Above Troposphere Clear dry layer Contains Ozone layer (absorbs energy from the sun & turns it into heat) – ….WARMS air above it – …PROTECTS us from harmful UV rays as gas molecules absorb solar radiation
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MESOSPHERE Coldest Layer – “sandwiched” between the … 1.Stratosphere : filters UV light (sun’s heat) & 2.Thermosphere: absorbs UV rays (sun’s heat) Meteors burn up here – Objects moving thru gas (air) encounters resistance as it pushes molecules out of the way 1. causing FRICTION 2. creating HEAT 3. Temp. rises, meteor GLOWS as it burns
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THERMOSPHERE Above the Mesosphere Air is very thin – Atoms are sparse & molecules are broken down- allows radio comm. Very hot! – Sunlight strikes this layer first – very sensitive to solar activity Can feel cold! Molecules are far apart but very DENSE so they ABSORB a significant part of the sun’s radiation.
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