Ocean Acidification

How much of the CO2 in the atmosphere will be absorbed by the oceans?

• all of it
• 1/2
• 1/4
• none of it

Carbon dioxide and seawater combine to form

• calcium carbonate
• carbon monoxide
• carbonic acid 

The H+ ion is a(n)

• acid
• base
• neutral

Marine organisms make their shells from calcium and

• chloride
• carbonate
• seawater

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

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

Which is a green-house gas?

• Methane
• Oxygen
• Hydrogen
• Ammonium

Which of the following are greenhouse gases?

• Carbon dioxide
• Methane
• Water vapour
• All answers are correct

What is the typical pH of a base?

• higher pH, >7

• 25 km

• lower pH, < 7

• 110 ppm