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