Water Use and Pollution

Fertilizer, sewage, and animal feces can wash in to water, leading to... 

• thermal pollution
• artificial eutrophication
• desalination
• biomagnification

97% of the water on earth is _________, making it undrinkable for humans.

• fresh water
• ground water
• salt water
• surface water

Water pollution that comes from a single source is considered...

• point source pollution
• nonpoint source pollution
• thermal pollution
• ocean pollution

Water pollution comes from two types of sources: point source and nonsource

• True
• False

The two underlying causes of water pollution are industrial and rapid human population growth.

• True
• False

The difference between point source and nonpoint source is that point source cannot be identified and nonpoint source comes from one source.

• True 
• False 

Pollutants usually enter groundwater when polluted surface water percolates down from the Earth's surface.

• True
• False

Water that causes erosion picks up _______________.

• sediments
• sewage
• pollutants
• algae

Most water pollution is the result of __________________.

• natural processes
• animal waste
• human activities
• acid rain

Wastes produced by agriculture, households, industry, mining, and other human activities can end up in ______________.

• groundwater
• streams and rivers
• oceans
• All of these choices