Hydrosphere: Freshwater

If excessive amounts of hot water are discharged into a lake, the immediate result will most likely be...

• an increase in sewage content

• a decrease in the amount of dissolved oxygen in the lake

• an increase of mercury in the lake

• a decrease in nitrates

Discharge entering a stream at a specific, detectable point such as a pipe or outfall.

• Point source pollution
• Non-point source pollution
• Fog
• Riparian

Diffuse runoff from large areas of land.

• Point source pollution
• Nonpoint source pollution
• Sediment
• Watershed

Rapid, dense growth of algae that robs the water of oxygen as it dies and decomposes.

• Algal bloom
• Sediment
• Point source pollution
• Non-point source pollution

Which of the following is NOT part of your ecological address?

• River basins
• Biodiversity
• Energy
• Metabolism

The totality of genes, species and ecosystems in a region

• Biodiversity
• Greenway
• Carrote=s
• Macroinvertebrate 

All of the following are reasons why macroinvertebrates are commonly used as bioindicators EXCEPT

• Many species are sensitive to pollutants and environmental stress
  
• They are easily collected.
  
  
• Unlike birds and mammals, they cannot easily escape aquatic sources of stress.
  
  
• Most species are primary producers and generate dissolved oxygen.
  

Thermal pollution can result when...

• DO levels decrease
• A factory dumps cooling water directly into a lake
• Nitrate levels peak
• Turbidity decreases

What effect can increased turbidity have on water temperature?

• Decreases temperature by blocking light.
• Decreases temperature by stimulating algal growth.
• Increases temperature  when the particles absorb sunlight
  
• There is no relationship between turbidity and temperature.

What is turbidity a measure of?

• Photosynthesis in water.
• Change in biological activity.
• Cloudiness of water.
  
• Solubility of atmospheric gases in water.