Human Impact on Water: Unit 8, Lesson- Retake

Pesticides, herbicides, and fertilizers are chemicals used in agriculture. How do they affect the water supply?

• By coming down as acid rain.

• Because metals and plastic produce toxic waste

• By seeping into groundwater.

Which of these statements is true of acid rain?

• It comes from metal or plastic products.

• It makes soil and water too acidic for life.

• It contains microbes that cause disease.

A factory is built on the bank of the Mississippi River. Water is used in the factory to make a product. The water is heated and then piped back into the river. What is this form of pollution called?

• Chemical pollution

• Biological pollution

• Thermal pollution

With thermal pollution, the warm water that is returned to a river or lake has less ____________ for organisms that live in the water.

• oxygen

• carbon dioxide

• hydrogen

Humans can cause different types of pollution. When live or dead organisms make their way into water systems, which type of pollution has taken place?

• chemical pollution

• thermal pollution

• biological pollution

pH is one of the measurements of water quality. Read the table above the bar graph first. Next, look at the bar graph that shows the pH values of several substances. Which substance is the strongest acid?

• bleach

• milk

• lemon juice

Which of these statements is true about non-point source water pollution?

• comes from one specific site

• comes from many small sources that is more difficult to control

• is always thermal pollution.

This would be an example of...

• point source pollution

• non-point source pollution

• acid rain

Which of these 3 choices is not a threat to our water supply?

• conservation

• demand

• drought

The movement of colored water through the gravel best models-

• condensation of water vapor

• pollution of groundwater

• conservation of water