Earth's Water 8.E.1

 Which would most likely result in an unhealthy aquatic habitat?

• a decrease in turbidity
• a decrease in nitrates levels
• an increase in water temperature
• an increase in dissolved oxygen levels

In which part of the ocean do the greatest number of organisms live?

• in the deep zone to escape predators
•  near the shore to burrow in the sand
• close to the surface to be near the largest food source
• in the open ocean to regulate their bodies in cooler temperatures

Which technological tool uses a sound echo to measure distance?

• sonar 
• submarine 
• ocean buoy
• robotic probe

Why might countries bordering the Pacific ocean have problems getting enough water to meet the needs of their citizens?

• The water is too cold to use. 
• Removing salt from the water is too expensive and impractical.
• There are more people in the countries than the water can nourish.

Which is the best way to conserve water?

• Take a daily bath rather than a shower. 
• Wash several small loads of clothing rather than a few large ones
• Use the dishwasher only for small loads rather than for large loads.
• Install low-flow toilets that reduce the amount of water being flushed. 

Why do large numbers of ocean life-forms live near areas of upwelling?

• Upwelling brings nutrients to the surface.
• Upwelling brings warm water to the surface
• Upwelling helps push small fish up toward the surface
• D. Upwelling keeps large predator fish away from the surface

Which of the following could occur as the result of runoff of high nitrogen fertilizers from farmlands near a lake?

• an increase in algae growth resulting in low oxygen levels in the lake
• a decrease in mineral storage reducing carbon levels of the lake
• a decrease in pollution resulting in lower ozone levels in the lake area 
• an increase in deforestation reducing animal populations in the lake area

Where does most fresh water exist? 

• ice caps, lakes, and streams 
• glaciers, rivers, and oceans 
• aquifers, ice caps, and glaciers

Which is the main source of dissolved oxygen in a body of water? 

• erosion 
• the atmosphere
• volcanic eruptions

Which can households do to help the local wastewater treatment facility function properly? 

• put food waste in a composter instead of in the trash
• dispose of cooking oil and grease in the kitchen sink 
• . flush only human waste and toilet paper down the toilet
• volunteer to help operate the treatment plant once a month