River Pollution

Which of the following statements is true?

• There is as much water on the Earth now as when the Earth was formed

• There is less water on the Earth now compared to when the Earth was formed

• There is morewater on the Earth now compared to when the Earth was formed

• The amount of water on the Earth changes from year to year

What percentage of water on Earth is salt water?

• 1%

• 3%

• 70%

• 97%

What percentage of the Earth's water is in the form of non-frozen fresh water?

• 1%

• 3%

• 70%

• 97%

Which of these is not an example of using a river for a 'source'?

• Used for drinking water

• Used to irrigate crops

• Used to generate hydroelectricity

• Used to dispose of industrial pollution (dumping)

Which of these water uses uses the LEAST water?

• Drinking

• Household Water Use

• Industrial Water Use

• Agricultural Water Use

Using water for recreation counts as ..

• Source Function

• Service Function

• Spiritual Function

• Sink Function

Dirt and soil that washes into rivers is called

• Gross Pollution

• Sediment

• Pathogens

• Point Source Pollution

Which of these is NOT a reason that sediment is dangerous to waterways?

• It can carry pathogens and nutrients with it into the water

• It blocks sunlight, killig plants on the riverbed

• It can prevent fish from seeing properly

• It can accumulate and block up rivers, preventing proper water flow

• It interferes with the nervous systems of animals that come into contact with it

Nutrients in rivers are usually caused by...

• Chemical fertilizers

• Industrial Pollution

• Pollution from oil washed off roads

• Soil Erosion

Nutrients in rivers lead to ...

• Toxic algal blooms

• All plant life along river banks dying

• Over-oxygenation of the water

• Low water temperature