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Homework answers / question archive / Question 1 1 / 1 pts What is the average salinity of the ocean expressed as parts per thousand (‰)? 3
Question 1
1 / 1 pts
What is the average salinity of the ocean expressed as parts per thousand (‰)?
3.5
35
0.35
350
1 / 1 pts
If you boil away 100 grams of seawater, how many grams of salt residue will be left behind?
0.35 grams
3.5 grams
35 grams
350 grams
1 / 1 pts
How do some algae species contribute to the sediments around coral reefs?
The root system of some species penetrate into the reef, breaking it apart into smaller pieces of sediment.
Some algae species deposit calcium carbonate in their tissues, which contribute to the layer of sediment when the algae dies.
Some algae species shade the coral reef, which kills the reef and causes it to crumble into sediment over time.
Extensive algae root systems help to hold onto sediment, which otherwise would be washed out to sea with the tide.
Video episode 9.
2 / 2 pts
The average pH of the ocean is 8 , which is slightly alkaline .
Answer 1:
Answer 2:
1 / 1 pts
What property of seawater can be measured in order to determine salinity?
The ratio of carbon dioxide to carbonic acid
The conductivity of ions present
The presence of oxygen isotopes
The color and transparency
1 / 1 pts
How does the ocean help to regulate greenhouse gasses and climate change?
The ocean releases much nitrogen into the atmosphere which can destroy the ozone layer.
Oceans with high productivity release large volumes of carbon dioxide into the atmosphere.
The ocean absorbs much of the carbon dioxide emitted from burning fossil fuels.
Nitrogen is taken up by the ocean and is stored in the deep-sea sediment layer.
1 / 1 pts
Why is it important to measure the ocean's salinity?
This measurement helps us track the progress of global climate change
Salinity controls the amount of water vapor released into the atmosphere, which affects hurricane formation
Salinity levels determine how much carbon dioxide is aborbed
Salinity affects density, which affects ocean circulation
2 / 2 pts
Compared to the atmosphere, the ocean holds more carbon dioxide and less oxygen.
Answer 1:
Answer 2:
1 / 1 pts
What is the relationship between pH and sea floor sediments?
Deep water can have a lower pH, which dissolves calcium-containing sediments.
High pH levels cause hydrogen ions to bind with other inorganic ions to create sediment layers.
Only organic, carbon-containing sediments can accumulate in the low pH levels of the sea floor.
Deep water usually has a very high pH, which dissolves calcium-containing sediments.
Question 10
0 / 1 pts
What contributes to the productivity of polar waters?
The high angle of the sun most of the year.
The close proximity of land masses.
6-months of sun and upwelling
Melting ice in the spring.
Video episode 9.
1 / 1 pts
What are the two most abundant salt ions present in seawater?
Magnesium and Sulfate
Silicon and Hydroxide
Bromine and Calcium
Sodium and Chloride
1 / 1 pts
What makes water such a good solvent?
It is polar and can dissolve ionic bonds
It is non-polar and cannot dissolve ionic bonds
It is polar and cannot dissolve ionic bonds
It is non-polar and can dissolve ionic bonds
From the section Water is a Powerful Solvent, Chapter 7.
1 / 1 pts
Why does the ocean often have a higher pH at the surface than it does at depth.
The ocean's buffer system does not work at the surface due to warm water.
The photons of light entering surface water break apart acid molecules.
There is less carbon dioxide in surface water because the water is warmer and photosynthesis removes it.
There is more carbonic acid at the surface than there is in deeper water.
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