Chapter 18 - Chapter 18 Landscapes of the sea Bathymetry...

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Chapter 18 Landscapes of the sea Bathymetry: variation in depth of the ocean 1. continental shelf : a relatively shallow portion of ocean in which water depth does not exceed 500m 2. abyssal plain : a vast nearly horizontal plain at about 4.5km deep 3. passive continental margins: margins that are not plate boundaries and thus lack seismicity 4. active continental margins: a margin that coincides with a plate boudnary and thus hosts many earthquakes Currents: rivers in the sea - two types of currents: surface currents at the upper hundred meters of the water and deep currents at the bottom of the sea in motion - currents from the poles to equator bring cold water and vice versa Downwelling: when surface water moves toward the coast, an oversupply of water develops along the shore and excess water must sink Upwelling: surface water moves away from the coast and a deficit of water develops near the coast and water rises to fill in the gap
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Chapter 18 - Chapter 18 Landscapes of the sea Bathymetry...

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