Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges...
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Transcript of Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges...
![Page 1: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor.](https://reader030.fdocuments.net/reader030/viewer/2022032705/56649dd05503460f94ac5b82/html5/thumbnails/1.jpg)
Ocean BathymetryTopography of the ocean floor
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Main RegionsContinental Margins – drowned edges of the continentsDeep-ocean Basins – the ocean floor that lies deeper than 2000 mMid-ocean Ridges – a continuous underwater mountain range that winds its way through all the oceans
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Continental MarginsFrom the land:
Continental shelf – almost flat, gradual slope seaward at the edges of the continents; covered with sediments from the landContinental slope – steeper slope seaward; contains submarine canyonsContinental rise – shallower slope composed of sediments that have fallen from slope.
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Continental Margin
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Deep-Ocean BasinsLie beyond the continental margins and
contain:Abyssal plains – very flat areas at depths of 3-5 kmSeamounts – underwater volcanoes, some > 1000 m highDeep-sea trenches – steep-sided, long, narrow depressions. Deepest regions on earth; found near continental margins
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Deep-Ocean Basins
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Mid-Ocean RidgesUnderwater mountain ranges that are the longest on earthOccupy 1/3 of the ocean floorNot all are “mid-ocean”Contain rift valleys at the summits as well as many fracture zones, where rocks have cracked and slid past one another
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Mid-Ocean Ridges
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Mid-Ocean Ridge Locations
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Which coast has the wider shelf?