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Sea Floor. Part 3. Underwater volcanic eruption! COOL. http:// www.youtube.com/watch?v = hmMlspNoZMs. Trenches . Sediments. Thicker the farther away from the ridge. Two types Lithogenous Biogenous Composed of CaCO3 or SiO2. Diatoms. Radiolarians. Foraminiferans. Coccolithophorids.

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sea floor

Sea Floor

Part 3

underwater volcanic eruption cool
Underwater volcanic eruption! COOL
  • http://www.youtube.com/watch?v=hmMlspNoZMs
sediments
Sediments
  • Thicker the farther away from the ridge.
  • Two types
    • Lithogenous
    • Biogenous
      • Composed of CaCO3 or SiO2
microfossils
Microfossils
  • The organisms that produce biogenous sediments are microscopic or close to it.
  • Sediment particles are sometimes called microfossils.
  • Can determine past climate
    • Carbon dating
    • Ratios of magnesium to calcium, isotopes of oxygen
continental margins
Continental Margins
  • Continental Shelf
  • Continental Slope
  • Continental Rise
  • Abyssal Plain
  • Draw a diagram and label each margin – take notes on your diagram about its characteristics
deep ocean basins
Deep Ocean Basins
  • The abyssal plain
    • Rises at a gentle slope towards the mid ocean ridge system.
  • Flat with some channels, low abyssal hills, plateaus and rises
  • Seamounts
  • Mariana Trench- 36,163 ft deep
hydrothermal vents
Hydrothermal Vents
  • Central rift valley
  • Black smokers
  • Life discovered around the hydrothermal vents
  • http://www.youtube.com/watch?v=rFHtVRKoaUM
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