Ocean acidification

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

• wood
• oil
• shale

Ocean acidification begins with 

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

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

The process of burning fuel to drive a car or operate a factory is called 

• photosynthesis
• combustion
• respiration

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

Too many greenhouse gasses in the atmosphere may block heat from escaping into space and trap too much heat next to the Earth’s surface causing

• another ice age
• earthquakes
• volcanic eruptions
• global warming