Water

Approximately what percentage of the water on Earth is fresh water?

• 97%
• 75%
• 10%
• 3%

Phosphates and nitrogen are common components of fertilizer. Why is the runoff of fertilizer a water pollutant?

• Excess nutrients such as phosphate and nitrogen contribute to eutrophication. 
• Phospates and nitrogen are toxic to aqutic organisms. 
• Phosphates and nitrogen cause an increase in the water temperature. 
• Phosphates and nitrogen aren't pollutants. 

What type of water pollution occurs when a power plant releases heated water into a lake or river?

• eutrophication
• thermal
• chemical 
• nonpoint

How many states are supplied by water from the Ogallala Aquifer?

• 5
• 6
• 7
• 8

Which of the following is NOT a state that is supplied with water by the Ogallala Aquifer?

• Nebraska
• Iowa
• Kansas
• Wyoming

Where can the majority of Earth's fresh water be found?

• lakes, rivers, and streams
• aquifers
• glaciers and icecaps
• atmosphere

Which of the following causes most of the pollution of oceans?

• Pollutants carried into the ocean by watersheds.
• Sewage sludge dumped directly into the ocean.
• Oil spills from tankers and off-shore oil rigs. 
• Ships dumping garbage into the ocean. 

Which of the following might occur as a result of plastic trash accumulating in the ocean? 

• Turtles mistake clear plastic bags for jellyfish and die of intestinal blockage. 
• Sea birds are strangled by plastic six-pack rings. 
• Sea mammals such as seals become entangled in clear plastic fishing line and drown. 
• All of these things might occur. 

A result of pumping water from aquifers is that

• farms produce fewer crops. 
• the recharge zone shrinks. 
• the aquifer cannot be recharged fast enough. 
• groundwater stops being collected. 

Which of the following types of water pollution decrease the amount of oxygen in a body of water?

• thermal pollution
• artificial eutrophication
• sediments blocking sunlight from plants
• All of these reduce the amount of oxygen in water.