SALT IN THE OCEANS. Composition of sea water Where do the salts come from? Weathering of rocks –...
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SALT IN THE OCEANS
Transcript of SALT IN THE OCEANS. Composition of sea water Where do the salts come from? Weathering of rocks –...
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SALT IN THE OCEANS
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Composition of sea water
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Where do the salts come from?
• Weathering of rocks– Na, Mg, Ca, K
• Underwater volcanic eruptions– Cl, Br, S
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Salinity
• Ratio of dissolved substance to the mass of water
• %= parts per hundred• 0/00= parts per thousand
• Seawater averages 35 0/00
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What can change salinity?
• Lowers salinity– Precipitation– Run-off– Melting land or sea ice
• Raises salinity– Evaporation– Formation of sea ice
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Glaciers
• Growing glaciers ________ salinity
• Melting glaciers ________ salinity
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Salinity
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Salinity map
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Dead Sea
• Salinity 300 ppt• No life forms
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Great Salt Lake, Utah
• Salinity 12 ppt• No fish• Stinky brine shrimp• Would you want to boat in this?
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Deep ocean currents