Jessica McLean EDU 290
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Jessica McLean EDU 290 Presentation Transcript

  • 1. Getting to know our Earth
  • 2. Introduction
    Sometimes people may forget or take for granted how lucky we are that Earth is so suitable for human life.
    Let’s find out more about our Earth by looking at:
    The Four Main Regions of the Earth
    How seismic waves tell us about Earth’s interior
    What it means to say the Earth is differentiated
    The Theory of Tectonics
    Earths Atmosphere
  • 3. Four Main Regions of the Earth
    Crust
    Mantle
    Outer Core
    Inner Core
  • 4. Interior of the Earth
    Core- consists of a solid inner core and a liquid molten outer core.
    Mantle- Rocky material containing the minerals silicone and oxygen
    Crust- Continental crust is made mostly of granite while Ocean crust is made of basalt.
    The lowest density rock is found at the crust while the highest density is found at the core
  • 5. Seismic Waves
    Seismic waves are waves of energy that pass through the Earth as a result of an Earthquake for example.
    P waves (primary waves) travel fastest and are produced first by an earthquake. P waves can travel through liquid and solid material.
    S waves (secondary waves) follow and do not travel through liquid.
  • 6. Application
    Scientists can use seismographs to record seismic waves and learn about the interior of Earth.
    After a volcano at some point the waves hit the outer core and because the outer core is liquid only the p waves can travel through and the s waves are stuck.
  • 7. Differentiation
    The Earth is made up of layers of different materials. This is due to differentiation.
    The Earth was once hot enough inside that it caused the interior to melt so that materials of higher density sank to the center and less dense materials went towards the surface.
  • 8. How did the Earth become so hot?
    Two major reasons explain the Earths heat.
    1. Planets were hot because of the process of formation. Colliding planetestimals deposited large amounts of energy that turned into heat.
    2. The metal and rock that make up the Earth contain radioactive elements that when decaying produce heat.
  • 9. Plate Tectonics
    Earths rocky outer crust is not solid but instead broken up into huge plates that sit on top of the mantle.
    The theory of plate tectonics explains the movement of Earths plates and the reason why we have earthquakes, volcanoes, mountains, trenches and many other geological features.
  • 10. Plate Tectonics Continued…
    At the boundaries of plates they may separate from one another, collide, slip past one another, and slip laterally.
  • 11. Processes that shape Earths Surface
    Impact Cratering
    Volcanism
    Tectonics
    Erosion
  • 12. Troposphere
    We live in the troposphere which is the lowest layer of Earth’s atmosphere.
  • 13. Earths Atmosphere
    Earths Atmosphere today consists of:
    78% nitrogen (N2)
    21% oxygen (O2)
    Small amounts of other gases
    Our atmosphere provides the air we breathe and the pressure that allows liquid water to flow
  • 14. Earth’s Early Atmosphere
    Earth’s original atmosphere consisted of volatile gases such as Carbon dioxide, Water Vapor, Methane, and Ammonia.
    How then did we come to have the atmosphere that allows human life now?
  • 15. Earth’s Changing Atmosphere
    When the Earth had cooled the water vapor had condensed and formed our oceans.
    Photosynthesis reduced the carbon dioxide level and increased oxygen that is necessary for all life.
    Carbon dioxide was also trapped inside rocks
    Volcanic eruptions released nitrogen into the air through a process called outgassing.
  • 16. Conclusion
    Our Earth is a complex planet that has grown and evolved since its formation millions of years ago.
    Next week we will compare Earth to other planets in order to understand further what makes it so unique.
  • 17. Sources
    Slide 1
    Picture: http://www.google.com/imgres?imgurl=http://img.dailymail.co.uk/i/pix/2007/07_03/nasa1R3107_1000x1000.jpg&imgrefurl=http://www.dailymail.co.uk/news/article-472122/Most-detailed-pictures-Earth-seen.html&h=1000&w=1000&sz=221&tbnid=XsopFnti7RPgrM:&tbnh=103&tbnw=103&prev=/search%3Fq%3Dpictures%2Bof%2Bthe%2Bearth%26tbm%3Disch%26tbo%3Du&zoom=1&q=pictures+of+the+earth&docid=O1b5XpbTR7sSYM&hl=en&sa=X&ei=NOaUTpvpMoLciAKUmqGMBQ&sqi=2&ved=0CDsQ9QEwAA
    Slide 2
    Picture:http://www.google.com/imgres?q=information+about+earth&um=1&hl=en&biw=1280&bih=570&tbm=isch&tbnid=QVPwqS25lFIJEM:&imgrefurl=http://theawesomefacts.blogspot.com/2011/04/awesome-facts-about-earth-you-may-newer.html&docid=EP4G_28bZpYejM&w=576&h=228&ei=1vaUToLRNMniiAK9h4mlBQ&zoom=1&iact=rc&dur=44&page=8&tbnh=88&tbnw=223&start=83&ndsp=10&ved=1t:429,r:2,s:83&tx=52&ty=68
    Slide 3Picture:
    http://www.physicalgeography.net/fundamentals/10h.html
    Slide 4
    Text:http://library.thinkquest.org/12232/data/TheEarthsInterior.htmlBennett/ Donahue/ Schneider/Voit’sThe Essential Cosmic Perspective. Sixth Edition. pages 192-193
    Slide 5
    Text: http://en.wikipedia.org/wiki/Seismic_wave
  • 18. Sources Continued
    Slide 6:
    Picture:http://www.kcvs.ca/martin/astro/au/unit7/172/chp17_2.html
    Text: Bennett/ Donahue/ Schneider/Voit’sThe Essential Cosmic Perspective. Sixth Edition. page 195
    Slide 7:
    Picture:http://www.indiana.edu/~geol105/images/gaia_chapter_3/earth_differentiation.htm
    Text:
    Bennett/ Donahue/ Schneider/Voit’sThe Essential Cosmic Perspective. Sixth Edition. Page 194
    Slide 8:
    Picture:http://www.google.com/imgres?q=earths+temperatures&um=1&hl=en&biw=1280&bih=570&tbm=isch&tbnid=7rsby46eNIROaM:&imgrefurl=http://www.scarborough.k12.me.us/wis/teachers/dtewhey/webquest/nature/plate_tectonics.htm&docid=AU2OtRwIg64RXM&w=507&h=388&ei=df2UTqLXEa2rsALNsMzvAQ&zoom=1&iact=hc&vpx=186&vpy=170&dur=112&hovh=196&hovw=257&tx=165&ty=131&page=1&tbnh=147&tbnw=192&start=0&ndsp=10&ved=1t:429,r:5,s:0
    Text: Bennett/ Donahue/ Schneider/Voit’sThe Essential Cosmic Perspective. Sixth Edition. Page 194
    Slide 9:
    Text: http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Continents.shtml
    Slide 10:
    Text and Picture: http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Continents.shtml
    Text: Bennett/ Donahue/ Schneider/Voit’sThe Essential Cosmic Perspective. Sixth Edition. Page 199
  • 19. Sources Continued
    Slide 11:
    Pictures:
    Erosion: http://www.google.com/search?hl=en&cp=12&gs_id=12&xhr=t&q=tectonics+plates&qe=dGVjdG9uaWNzIHBs&qesig=u8up7J7wF_ImuT1MSJxwHA&pkc=AFgZ2tlo8xdWexearn9yWLvwNhqpTjx3503MBIWTVlk3K2b6ChQTeVXhGqz397NwDX6oRV42ss5HDf2sbOR78_osiCqa5qhqLQ&gs_sm=&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1280&bih=570&wrapid=tljp1318389175936018&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi#um=1&hl=en&tbm=isch&sa=1&q=erosion&oq=erosion&aq=f&aqi=g10&aql=&gs_sm=e&gs_upl=2607l5321l0l5696l20l9l0l0l0l3l402l1164l4.3.4-1l9l0&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=62195ff4a89d15b&biw=1280&bih=570
    Tectonic Plates:http://www.google.com/imgres?q=tectonics+plates&um=1&hl=en&sa=N&biw=1280&bih=570&tbm=isch&tbnid=b0d3cTrRmLy7WM:&imgrefurl=http://www.moorlandschool.co.uk/earth/tectonic.htm&docid=vh71KLxugM92lM&w=429&h=254&ei=bQaVTs6qAvKpsALZkJnvAQ&zoo
    Volcanoes:http://www.google.com/search?hl=en&q=volcanism&gs_sm=e&gs_upl=3437l6657l0l6861l21l12l0l0l0l1l290l2358l0.3.7l11l0&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1280&bih=570&wrapid=tlif131838941166910&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi
    Impact Cratering:http://www.google.com/search?hl=en&q=volcanism&gs_sm=e&gs_upl=3437l6657l0l6861l21l12l0l0l0l1l290l2358l0.3.7l11l0&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1280&bih=570&wrapid=tlif131838941166910&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi#um=1&hl=en&tbm=isch&sa=1&q=impact+cratering&oq=impact+cratering&aq=f&aqi=g1g-S3g-mS2&aql=&gs_sm=e&gs_upl=49860l54965l0l55263l20l14l1l1l1l0l237l1462l4.6.1l11l0&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=62195ff4a89d15b&biw=1280&bih=570
    Text: Bennett/ Donahue/ Schneider/Voit’sThe Essential Cosmic Perspective. Sixth Edition. Page 197
  • 20. Sources Finale
    Slide 12:
    Picture:http://www.google.com/search?hl=en&cp=7&gs_id=k&xhr=t&q=earths+layers+of+atmosphere&qe=ZWFydGhzIA&qesig=jZln4vNkirtn-pRWyJwWFA&pkc=AFgZ2tmYp_QwmVeG3aiulbjkIVzixtIUxWtNto3-21HHSoRmJyYTADFt6ArcM8gBF29LL_158_LcC9ec1o4u8-ntd2xfy7yDQA&gs_sm=&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1280&bih=570&wrapid=tljp1318439904501012&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi
    Text:http://www.windows2universe.org/earth/Atmosphere/troposphere.html
    Slide 13:
    Picture: http://www.123rf.com/photo_10245620_air-composition-pie-chart.html
    Text: Bennett/ Donahue/ Schneider/Voit’sThe Essential Cosmic Perspective. Sixth Edition. Page 200
    Slide 14:
    Text: http://www.globalchange.umich.edu/globalchange1/current/lectures/Perry_Samson_lectures/evolution_atm/index.html
    Slide 15:
    Picture:http://www.globalchange.umich.edu/gctext/Inquiries/Inquiries_by_Unit/Unit_8.htm
    Text: http://en.wikipedia.org/wiki/Earth%27s_atmosphere
    Bennett/ Donahue/ Schneider/Voit’sThe Essential Cosmic Perspective. Sixth Edition. Page 198