composition of seawater
DESCRIPTION
TRANSCRIPT
![Page 1: Composition of seawater](https://reader034.vdocuments.site/reader034/viewer/2022050808/54934a0cb4795925048b4573/html5/thumbnails/1.jpg)
Chemical Composition of Seawater
70% of earth’s surface is covered in water – let’s see what’s in that water!
![Page 2: Composition of seawater](https://reader034.vdocuments.site/reader034/viewer/2022050808/54934a0cb4795925048b4573/html5/thumbnails/2.jpg)
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
![Page 3: Composition of seawater](https://reader034.vdocuments.site/reader034/viewer/2022050808/54934a0cb4795925048b4573/html5/thumbnails/3.jpg)
Seawater is ConsistentLaw 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
![Page 4: Composition of seawater](https://reader034.vdocuments.site/reader034/viewer/2022050808/54934a0cb4795925048b4573/html5/thumbnails/4.jpg)
How did the salt get to the sea?
![Page 5: Composition of seawater](https://reader034.vdocuments.site/reader034/viewer/2022050808/54934a0cb4795925048b4573/html5/thumbnails/5.jpg)
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
![Page 6: Composition of seawater](https://reader034.vdocuments.site/reader034/viewer/2022050808/54934a0cb4795925048b4573/html5/thumbnails/6.jpg)
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
![Page 7: Composition of seawater](https://reader034.vdocuments.site/reader034/viewer/2022050808/54934a0cb4795925048b4573/html5/thumbnails/7.jpg)
Q: Why aren’t the oceans getting saltier?
Watch and review: http://www.oceanclassrooms.com/resources/storyline/unit3/MS101_U3_C1_SA_1/story.html