The Oceans.ppt I

The Oceans.ppt I - Oceanography Study of the oceans based...

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Oceanography Study of the oceans based on knowledge of biology, chemistry, physics, and geology
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Basic concepts Oceans compose of 71 percent of our Earth’s surface Approximately 140 million square miles In Northern Hemisphere, 61% of the surface is water In Southern Hemisphere, almost 81 % of the surface is water
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Four main ocean basins Pacific Ocean Atlantic Ocean Indian Ocean Arctic Ocean
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Main ocean basins (cont.) Pacific Ocean is the largest and the deepest ocean (12,927 feet at its deepest point) Atlantic Ocean is about half the size of the Pacific Ocean, and relatively narrow compared to the Pacific Indian Ocean is largely a Southern Hemisphere water body Arctic Ocean is the smallest and the shallowest of all the oceans
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Composition of Seawater Seawater contains a variety of salts, metals, and other dissolved gases Seawater is unfit for human consumption an irrigation Seawater contains 3.5 % (by weight) of dissolved salts The most abundant salt is sodium chloride (table salt)
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Salinity Salinity is the total amount of dissolved material in seawater Expressed in percent or parts per thousand
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Sources of sea salts Chemical weathering of rocks on the continents Volcanic eruptions
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Processes Affecting Salinity Processes that add large amounts of fresh water to seawater Process remove large amounts of fresh water from seawater
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Processes that add freshwater from seawater Melting of polar ice caps/icebergs Precipitation Runoff from land These processes tend to decrease salinity by diluting the salts
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Processes that remove freshwater from seawater Evaporation Formation of sea ice/icebergs These processes tend to increase the salt content (salinity) of seawater
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The Oceans.ppt I - Oceanography Study of the oceans based...

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