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unit eight.ppt - The Sea Floor The Water Planet Ocean intro...

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The Sea Floor The Sea Floor
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The Water The Water Planet Planet Ocean intro over 70% of Earth’s surface is covered by oceans prior to 1950 little was known about the deep ocean floor oceans originated primarily from volcanic degassing of water vapor from Earth’s interior
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Studying the Studying the Sea Floor Sea Floor Sea floor rocks – quite widespread, but difficult to study sea floor sampled using rock dredges , seafloor drilling , or submersibles indirect observations – sonar and seismic reflection profiling
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Features of the Features of the Sea Floor Sea Floor Passive continental margins continental shelf , continental slope , continental rise and abyssal plain Active continental margins continental shelves and slopes, but the slope extends down into a deep oceanic trench Mid-oceanic ridge system – encircles the globe, typically running down the center of oceans Numerous conical seamounts rise from the deep ocean floor
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Continental Shelves Continental Shelves and Slopes and Slopes Continental shelves – gently (0.1°) seaward-sloping shallow submarine platforms at the edges of continents range in width from a few km to >500 km typically covered with young
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