Atmosphere

Layers of the Atmosphere Troposphere Closest to Earth Stratosphere Contains the ozone layer Mesosphere Meteors burn up Thermosphere Ionosphere Polar auroras Shuttles Exosphere Satellites http://www.natgeoeducationvideo.com/film/1172/earths-atmosphere

Ozone

What is the Ozone The Ozone Layer | National Geographic Education Video Colorless gas O3: Three oxygen atoms The oxygen we breath only has two oxygen atoms ( O2) Located in the stratosphere Is a greenhouse gas and does help govern Earth’s climate

Ozone Questions How is a molecule of ozone different from a molecule of atmospheric oxygen?  A. Atmospheric oxygen has one more oxygen atom than ozone B. Atmospheric oxygen has one less oxygen atom than ozone. C. Oxygen and ozone are the same; they are found at different layers of the atmosphere D. Oxygen is produced by plants; ozone is produced when oxygen combines with CO2

How was Ozone Created? See article/picture on the board

Ozone affects in the lower and upper atmosphere Cause rubber to crack Harmful to plants Damages lung tissues Consider pollution Absorbs harmful ultraviolet radiation from the sun UV-B Protects living organisms

Ozone Questions Where is ozone considered a pollutant? A. in the upper atmosphere where it blocks the suns rays B. in the mid-atmosphere where it prevents cloud formation. C. in the lower atmosphere where it impairs normal lung function. D. it is a pollutant everywhere it is found.

Ozone Question What does the ozone layer protect living things from? A. bad weather B. ultraviolet rays C. excessive heat D. meteors and meteorites

Ozone Depletion Greatest effects are seen at Earth’s poles Ozone Hole Greatest effects are seen at Earth’s poles Antarctic: ozone hole forms from September to November Artic: ozone hole forms from March to May Not as bad as Antarctic ozone hole because the Artic doesn’t experience as cold of temperatures as Antarctic. “The largest ozone hole ever observed occurred on 24 September 2006.” http://ozonewatch.gsfc.nasa.gov/, April 6, 2011

Ozone Depletion Ozone Hole Chemical reactions involving chlorine, bromine, nitrogen, and hydrogen break down the ozone layer. Also CFCs (chlorofluorocarbons) have contributed to the break down. In the winter time at each pole the chlorine and bromine will gather together, because of the lower temperatures and less sunlight. Then in the spring and summer months the sunlight will increase and start the change reaction of the Cl and Br breaking down the ozone layer creating a hole. Teachers' Domain: Ozone Hole http://news.nationalgeographic.com/news/20 08/11/081103-ozone-video-vin.html

Ozone Questions What health issue associated with the ozone hole? A. difficult breathing B. fever C. skin cancer D. nagging cough

Earth’s atmosphere did not originally contain ozone or oxygen Earth’s atmosphere did not originally contain ozone or oxygen. Where did these gasses come from? A. plants released oxygen which formed ozone in the upper atmosphere. B. animals produced ozone and it has broken down to become oxygen. C. as Earth warmed, oxygen and ozone were released from the oceans D. oxygen is a product of respiration and can form whenever things decompose.

Life on land did not develop on Earth in abundance until the sun’s radiation was reduced. When did this happen? A. when human beings built machines that burn fossil fuels. B. when ozone had been absorbed out of the upper atmosphere C. when plants had an opportunity to live with animals D. when enough ozone had built up in the upper atmosphere