75 Composition and Structure of the Atmosphere What is the composition of Earths Atmosphere SC6E79 LA6223 Composition of Earths Atmosphere The atmosphere is the protective covering of Earth It keeps Earth warm and protects it from ID: 765884
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7.5 Composition and Structure of the Atmosphere What is the composition of Earth’s Atmosphere? SC.6.E.7.9, LA.6.2.2.3
Composition of Earth’s Atmosphere The atmosphere is the protective covering of Earth. It keeps Earth warm and protects it from harmful sun rays. The composition of the mixture of gases that we call the atmosphere is: Nitrogen (N) 78% Oxygen (O 2 ) 21% Total of just these 2 gases = 99 % Less than 1% Carbon Dioxide , (CO 2 ) Argon, (Ar)& other trace gases BTW – what is the most abundant element in our earth’s soil? OXYGEN !!!!!!
Which circle graph shows the correct Composition of the atmosphere—page 261 Main Gases in Air
Composition Continued Water Vapor: water in the form of a gas can be found in the air.The amount of water vapor in the air is different from place to place and time to time.Particles: Tiny solid particles of dust, smoke, salt, and chemicals found in the air.BTW – where does most of the dust in your house come from?
Draw arrows showing which direction air density decreases / temperature increases.
How did you draw your arrows? As you rise into atmosphere, the Density of airDECREASESAnd as you sink the Temperature of the airINCREASES
4 Main Layers These layers are classified according to changes in temperature. * Thermosphere* Mesosphere* Stratosphere* TroposphereAtmosphere Video Clip
The Troposphere ! Lowest layerWe live here Weather occursAbout 12 km thick (WBMS-Navarre Post Office)(10 K = 6.2 miles – a typical race distance)So 12 km = about 7.5 miles thickvaries from 9 km (at the north and south poles)To about 16 km (at the equator)Shallowest, but MOST denseAs altitude ↑ The Temperature ↓
The Strat osphere 2nd layer: Extends from top of Troposphere to ~50 km (WBMS to Destin Commons)Ozone layer is here. What is Ozone?Ozone has 3 atoms of Oxygen, not just 2Lower Stratosphere is cold, about ⁻60˚CUpper Stratosphere is warmer than lowerWhy? Middle of Stratosphere is where Ozone layer is it absorbs energy and warms the air.The Ozone layer also protects us from UV radiation from the sun.
The Mesosphere Middle Layer 50-80 km above Earth (WBMS to Florabama)Temperatures approach ⁻90˚C (-130 F)Protects us from meteoroids – where meteors first encounter friction from gases in atmosphere.
The Thermosphere Outermost layer of the atmosphere Above 80 kmTemperatures up to 1800˚C (3,272 F) because sunlight strikes it firstDoesn’t feel warm though, because the molecules are far apartAuroras happen hereIonosphere—is the lower layer of the ThermosphereExosphere—is the outer layer from 400 km to thousands of kilometers