The Earth is surrounded by a “blanket” of air called the atmosphere. http://www.lunaroutpost.com/gallery/earth/pages/earth_full_hires%20copy.htm
The Earth’s Atmosphere is a mixture of gases: http://webusers.astro.umn.edu/~john/Ast1001/air/atmos-compos.jpg
What are some natural events that afffect the earth’s atmosphere? Forest fires Volcanic ash http://upload.wikimedia.org/wikipedia/en/thumb/4/49/Wildfire3.jp g/240px-Wildfire3.jpg http://www.windows2universe.org/earth/interior/ash.html
What keeps the atmosphere so close to the earth??? GRAVITY! http://www.cs.dartmouth.edu/farid/sciencekids/gravity2.jpg
Although it seems thin, the atmosphere is ~500 miles thick!
Even the International Space Station flies within the Earth’s atmosphere! http://nssdc.gsfc.nasa.gov/image/spacecraft/iss.jpg
The atmosphere has five basic layers. http://www.theozonehole.com/atmosphere.gif
THE LAYERS ARE DETERMINED BY CHANGES IN TEMPERATURE http://www.windows2universe.org/earth/Atmosphere/layers_a ctivity_print.html
Temperatures in the Atmosphere Why does the graph zigzag back and forth?
We live in the lowest layer, the troposphere. http://www.fas.org/irp/imint/docs/rst/Sect14/atmosphere.jpg
Most of Earth’s weather takes place in the troposphere. http://images.worldofstock.com/slides/TRA1094.jpg
About ten miles up is the Tropo- pause, where the troposphere ends. Most jet planes can fly close to or just above the tropopause.
Between each atmospheric layer, we have a “pause” or break. These are arbitrary lines- and not real breaks. http://www.epa.gov/apti/course422/images/fig-1.gif
After the troposphere comes the stratosphere. http://www.greenfacts.org/glossary/images/stratosphere-troposphere.jpg
High winds in the statosphere are called the Jet Stream. www.accuweather.com/www/nyc/jetstream.gif
The Ozone layer (O 3 ) can be found in the stratosphere. It protects us from harmful UV radiation from the sun. http://veimages.gsfc.nasa.gov/138/ozone_hole_large.jpg http://www.okiu.ac.jp/Language/contest/02/12/ozone.gif
Weather Balloons explore the stratosphere. http://www.discover.uottawa.ca/~aelsawah/GNG1101/LAB2_files/image004.jpg http://www.ssec.wisc.edu/sose/wvi/images/scen3.jpg
In the Stratosphere… spy planes! http://retrothing.typepad.com/photos/uncategorized/2007/12/21/sr71bla ckbird.jpg
Believe it or not, 99% of all the gases that surround the earth are found in the first two layers we’ve seen so far.
Things found in the Exosphere. http://nssdc.gsfc.nasa.gov/image/spacecraft/iss.jpg http://www.boeing.com/defense-space/space/hsfe_shuttle/images/nasa-sys_shuttle_sts071-741_200X250.jpg
Satellites orbit Earth in the exosphere. http://www.wmo.ch/web/www/images/GOS/Figure%20II-10%20Satellites.jpg
If it weren’t for the atmosphere, our earth would look like…
http://www.astrosurf.com/cidadao/moon_99_02_23_south.jpg The moon, with thousands of impact craters.
Because the moon has less gravity and much higher temperatures than the earth, its gases get “excited” or very energetic, and are lost to space. http://www.abc.net.au/science/features/lunaeclipse2007/
What is Air Pressure? Air pressure is the weight of the atmosphere pressing down on an area of the earth. http://dogfoose.com/infotoons/
Pressure changes with altitude – the higher altitude, the lower the air pressure. htt://images.google.com/imgres?imgurl=http://www.physical geography.net/fundamentals/images/pressure_altitude.jpg&i mgrefurl=http://www.physicalgeography.net/fundamentals/7d.html&usg=__2bKRE46nD8PHInoiyOVgt1Lv2ok=&h=580& w=491&sz=59&hl=en&start=5&tbnid=qFc- E7U_YbFDyM:&tbnh=134&tbnw=113&prev=/images%3Fq %3Dair%2Bpressure%26gbv%3D2%26hl%3Den%26safe%3 Dactivep