Composition of seawater
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Composition of seawater






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Composition of seawater Composition of seawater Presentation Transcript

  • Chemical Composition of Seawater 70% of earth’s surface is covered in water – let’s see what’s in that water!
  • What is actually in seawater? Every naturally occurring element on earth has been found in seawater. Obviously, seawater is mostly water! The rest of seawater is composed of the following
  • Seawater is Consistent Law of Constant Proportions: The ions in the world’s oceans remain relatively constant. In other words… In almost all of the world’s oceans the ratios of each ion to one another remain the same: 55% chloride:31% sodium:8%sulfate:4%magnesium:1%calcuim:1%potassium Q: Can you think of a place that might be the exception to this rule? A: Where rivers meet the sea…river water frequently contains more calcium ions
  • How did the salt get to the sea?
  • Salt is added to ocean water by… • Weathering: On land, rivers carry eroded rock and mineral debris containing salts out to the sea • Seismic Activity: In the deep sea, underwater volcanoes & vents react with seawater and spew lava, rock, and/or mineral debris containing salts into the sea around them
  • Salt is removed from ocean water by… • Sea Spray: We will see evidence of this at Sunken Forest in the spring. Have you seen it on your sunglasses after a day at the beach? (remember Evaporites?) • Sediment Deposits: as sediment falls to the seafloor, sometimes it binds to minerals in the water around it or just gets buried • Biological Activity: through the processes associated with life, marine animals and plants sometimes take in salts from the water around them
  • Q: Why aren’t the oceans getting saltier? Watch and review: