Seafloor features

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Seafloor features

  1. 1. Prior knowledge check <ul><li>Have you ever walked out into the ocean water? If so, do you know the name of the part of the Earth you walked on? </li></ul><ul><li>What happens as you walk further out to sea? </li></ul><ul><li>What does topography mean? </li></ul>
  2. 2. Topography <ul><li>A detailed map of the physical features of a region. </li></ul>
  3. 3. The Seafloor <ul><li>Objective: </li></ul><ul><li>Describe the seafloor features. </li></ul>
  4. 4. Continental Shelf and Slope <ul><li>The continental shelf starts at the coastline and connects to the continental slope with a slight decline. </li></ul><ul><li>The continental slope connects the shelf to the seafloor and is typically very steep. It is carved out by currents. </li></ul>
  5. 5. The Continental Shelf <ul><li>The pink region below is the shelf. It can extend out over 200 miles. Most ocean life lives here. </li></ul>
  6. 6. Abyssal Plains <ul><li>Seafloor areas that are relatively flat because they have been filled in with sediment. </li></ul><ul><li>There is very little life in these areas. </li></ul>
  7. 7. Mid-Ocean Ridge <ul><li>An underwater mountain chain </li></ul><ul><li>This is where new ocean floor is made by seafloor spreading </li></ul><ul><li>Remember that seafloor spreading happens at divergent plate boundaries. The plate move apart allowing magma to seep up. </li></ul>
  8. 8. An Ocean Trench <ul><li>Convergent plates form ocean trenches. </li></ul><ul><li>One plate slides under the other. </li></ul><ul><li>Trenches are the deepest places on Earth </li></ul><ul><li>The Marianas Trench is ~ 7 miles deep </li></ul><ul><li>The Grand Canyon, in comparison, is only ~ 1 mile deep </li></ul>
  9. 9. Islands
  10. 10. Seamounts
  11. 11. Wrap-up <ul><li>How deep is the Mariana’s Trench? </li></ul><ul><li>What kind of boundary is at an ocean trench? </li></ul><ul><li>What is the underwater mountain range where seafloor spreading occurs called? </li></ul>
  12. 12. Seafloor Mining <ul><li>Petroleum, natural gas and placer deposits are mined from continental shelves. </li></ul><ul><li>Manganese nodules are deep-water deposits that may be mined in the future. </li></ul>
  13. 13. petroleum <ul><li>An oily flammable liquid obtained from the ground that can be made into gasoline </li></ul>
  14. 14. Manganese <ul><li>A metallic chemical resembling iron but not magnetic </li></ul>
  15. 15. Wrap-up <ul><li>How are placer deposits formed? </li></ul><ul><li>What is the name of an underwater mountain range? </li></ul>

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