Acidification of the Ocean

Man made carbon dioxide comes from the burning of fossil fuels.  An example of a fossil fuel is

• wood
• oil
• shale

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Ocean acidification begins with 

• pollution from ships
• carbon dioxide released from combustion
• dumping of waste from cities into the ocean

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NGSS.HS-ESS2-6

Carbon dioxide and seawater combine to form

• calcium carbonate
• carbon monoxide
• carbonic acid 

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NGSS.HS-ESS2-6

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Marine organisms make their shells from calcium and

• chloride
• carbonate
• seawater

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An example of a marine organism that needs calcium carbonate 

• a crab
• a shark
• an octopus

Very slight increases in the acidity of seawater __________  marine organisms that make shells.

• doesn't bother
• has no effect on 
• is unhealthy and stresses

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Carbon dioxide levels in the air have changed throughout earth's history.  The difference today is how ______ the change is happening.

• rapidly 
• slowly 
• wide spread

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NGSS.HS-ESS2-6

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An increase in 0.1 pH represents how much increase in acidity?

• 1-10%

• 10-15%

• 25-30%

• over 100%

Why would the loss of plankton because of increasing acidity be a long term problem for the oceans?

• plankton provide materials to build shells for crabs

• plankton is an important part of many aquatic food chains

• plankton are builders of coral for reefs

• plankton help clean up the ocean floor

The pH of the ocean used to be

• 7.0

• 7.5

• 8.2

• 8.1