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Stratosphere

Holt Earth Science Chapter 17, Section 17.1

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Atmosphere of Earth
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Vertical Structure of the Atmosphere A. Pressure Changes Atmospheric Pressure: weight of the air above - at sea level, the avg. pressure ~ 1000 millibars (mb), or ~ 1 kg/cm2 Pressure at higher altitudes is less ? of the atmosphere is below 5.6 km (3.5 mi); at 16 km (10 mi), 90% of the atmosphere has been passed, and > 100 km (62 mi), only 0.00003 % of all gases in the atmosphere remain. Rest of atmosphere merges with space vacuum. B. Temperature Changes Near Earth?s surface, air temperature drops with an increase of height. I. Troposphere (air ?turns over?) Lowermost atmosphere layer (we live in here); temperature decreases with an altitude increase. All important weather occurs here.

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Chapter 18: Chemistry of the Environment Priyal Patel AP Chemistry 0pd 18.1 Earth?s Atmosphere Temperature varied due to altitude Decreases with increasing altitude Layer of atmosphere Troposphere Stratosphere Mesosphere Thermosphere Composition of the Atmosphere Not uniform Bombarded with radiation and energetic particles Lighter atoms rise to top N2 triple bond for between Nitrogen atoms O2 Much more reactive Reacts to form oxides 18.2 The Outer Regions of the Atmosphere Outer portion of atmosphere is important in determining conditions of life Upper layer forms outer defense against radiation and high-energy particles Photodissociation Rupture of a chemical bond resulting form absorption of a photon by a molecule Does not form ions Forms two neutral particles

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Gone With the Wind

Michael Treacy 3/3/2010 Pd. 3 Ozone Hole @ TD 1. What is the Ozone and why do we need it in our atmosphere to have a healthier planet? The Ozone is the Gas O3. This gas is located in the Stratosphere and absorbs UV Rays. We need the ozone in our atmosphere because it absorbs 98% of the UV Rays. Without the ozone to filter all these UV Rays many animals would have medical / health problems. 2. Describe how the ozone protects us. The ozone protects us by filtering out and absorbing most of the UV Rays before they reach the earth. Most of the Rays are biologically harmful and know to damage tissues and cells. 3. How is a chlorine atom harmful to the ozone in the stratosphere?
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