Earth's Water

 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 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 would most likely cause a sudden increase of nitrates in a waterway?

• spill from an oil tanker

• runoff from a boat yard

• runoff from a golf course or farmland

• discharge from a chemical plant

Which is an unlikely source of water for a river basin?

• melting snow 
• ocean water 
• melting ice 

Of the 74% of Earth’s surface that is covered in water, which contains the most water? 

• lakes 
• rivers 
• oceans 
• streams