ocean bathymetry topography of the ocean floor. main regions continental margins – drowned edges...

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Ocean Bathymetry Topography of the ocean floor

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Page 1: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

Ocean BathymetryTopography of the ocean floor

Page 2: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

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

Page 3: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

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.

Page 4: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

Continental Margin

Page 5: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

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

Page 6: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

Deep-Ocean Basins

Page 7: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

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

Page 8: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

Mid-Ocean Ridges

Page 9: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

Mid-Ocean Ridge Locations

Page 10: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

           

                        

Page 11: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor
Page 12: Ocean Bathymetry Topography of the ocean floor. Main Regions Continental Margins – drowned edges of the continents Deep-ocean Basins – the ocean floor

Which coast has the wider shelf?