WatEr

How can groundwater become polluted?

• People throwing trash on the ground.

• Oil spills in the ocean.

• Pollutants on the ground seeping through the soil.

• Atmospheric deposition.

What can happen if fertilizer gets into streams or lakes when water runs off after it rains?

• Plants such as algae can grow out of control.

• Chemicals such a DDTs & PCBs can get into the fish.

• The water can get too warm.

This type of pollution comes from any heating of natural water that results from human activity

• Thermal pollution

• Chemical pollution

• Biological pollution

A farmer applies excess fertilizer to one of her fields just before a rainstorm. What kind of pollution is this most likely to lead to?

• Toxic

• Sediment

• Nutrient

• Bacterial

A(n) ____________________ is an underground rock formation that holds water.

• aquifer

• estuary

• cave

Water that contains waste from homes and industry is called

• groundwater

• wastewater

• aquifer

Three percent of the world's water resources are found as

• freshwater

• salt water

• Icecaps and glaciers

• groundwater

Freshwater is a limited resource because

• most water is polluted

• Most surface water contains salt

• It is controlled by powerful governments

• Dams have limited the flow of fresh water

sources of ocean pollution include

• oil spills

• direct dumping of waste

• activities on land

• all of the above

Many people on Earth do not have access to clean drinking water

• true

• false