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SALT IN THE OCEANS

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Page 1: 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,

SALT IN THE OCEANS

Page 2: 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,

Composition of sea water

Page 3: 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,

Where do the salts come from?

• Weathering of rocks– Na, Mg, Ca, K

• Underwater volcanic eruptions– Cl, Br, S

Page 4: 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,

Salinity

• Ratio of dissolved substance to the mass of water

• %= parts per hundred• 0/00= parts per thousand

• Seawater averages 35 0/00

Page 5: 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,

What can change salinity?

• Lowers salinity– Precipitation– Run-off– Melting land or sea ice

• Raises salinity– Evaporation– Formation of sea ice

Page 6: 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,

Glaciers

• Growing glaciers ________ salinity

• Melting glaciers ________ salinity

Page 7: 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,

Salinity

Page 8: 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,

Salinity map

Page 9: 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,

Dead Sea

• Salinity 300 ppt• No life forms

Page 10: 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,

Great Salt Lake, Utah

• Salinity 12 ppt• No fish• Stinky brine shrimp• Would you want to boat in this?

Page 11: 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,

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