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The Great Rift Valley

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The Great Rift Valley

  1. 1. The Great Rift Valley By: Chris Carlson
  2. 2. What is it? <ul><li>The Great Rift Valley is an enormous fault in East Africa </li></ul><ul><li>A fault is a crack or break in Earth’s crust </li></ul>
  3. 3. How big is it? <ul><li>The Great Rift Valley is about 4,000 miles long </li></ul><ul><li>It can be 1,300 ft. below sea level </li></ul><ul><li>It can be 6,000 ft. above sea level </li></ul>
  4. 4. How was it created? <ul><li>Thermal bulges were formed </li></ul><ul><li>They fractured the crust into faults </li></ul><ul><li>Spaces between the faults were filled by down-dropped rocks (grabens) </li></ul><ul><li>Basalt floods, lava flows that cover a large area, thickened the area </li></ul><ul><li>Erosion wore away some of the spaces </li></ul>
  5. 5. How was it created? (cont.)
  6. 6. What is it like there? <ul><li>It varies in temperature and climate because of it’s many different elevations and features </li></ul>
  7. 7. How does it affect the area? <ul><li>The different elevations caused East Africa to be more sensitive to climate change </li></ul><ul><li>That lead to alternations between wet and dry periods (not seasons) </li></ul>
  8. 8. What will happen to it in the future? <ul><li>It will continue stretching and deepening until surrounding water will fill it </li></ul><ul><li>Then, Somalia and Africa will break apart </li></ul><ul><li>This is what created Madagascar </li></ul>
  9. 9. Is there anything else like it? <ul><li>Yes, there is a West Antarctic Rift </li></ul><ul><li>It is slowly breaking West Antarctica away from the continent </li></ul>
  10. 10. Why is the Great Rift Valley so important to Africa? <ul><li>The rift valley’s alternating wet/dry periods caused humans to become smarter so they could adapt </li></ul><ul><li>The rift valley has changed Africa’s own geography </li></ul><ul><li>The rift valley elevations have altered climates in Eastern Africa </li></ul>
  11. 11. Sources (Info) <ul><li>www.platetectonics.com </li></ul><ul><li>www.geography.howstuffworks.com </li></ul><ul><li>www.geology.com </li></ul><ul><li>www.sciencedaily.com </li></ul><ul><li>www.infoplease.com </li></ul>
  12. 12. Sources (pictures) <ul><li>www.sciencedaily.com </li></ul><ul><li>www.amazon.co.uk </li></ul><ul><li>www.geology.com </li></ul><ul><li>www.pyroda.gov.ua </li></ul>

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