Topic 7: Lesson 4 - Water Pollution

Why is all water not renewable?

• most water is salt water, and salt water is not renewable

• only 1% of water is drinkable, which makes it limited

• fresh water is evenly distributed

• 1/3 of all fresh water is frozen

I live near a river that flows through farmland. I notice the river has become more polluted over the years.

What is most likely the cause of pollution in the river?

• heat

• oil and gas

• industrial waste

• pesticides and fertilizer

An island is located in an area where ocean pollution collects. IT is estimated the beaches are covered with 38 million pieces of trash. Which statement best explains one way this trash affects animals on the island?

• there is food that the animals can eat in the trash

• animals have difficulty crossing the beaches to get to the water

• animals can get tangled up in the trash and be unable to swim or move

• when animals die from eating trash, they provide a food supply for other animals

Which three ways will be effective in reducing water pollution?

• clean up and prevent oil spills

• enact laws that control pollutants

• have factories dump wastes on the land instead of in water

• encourage farmers to leave plants in the field after harvest to prevent runoff

Which are point sources of pollution? (choose 2)

• wastewater treatment plants

• factories

• suburban development

• croplands

What type of pollution originates in croplands? (Choose 3)

• pesticides

• fertilizers

• eroded soil

• carbon dioxide

Which is a source of pollution from animal feedlots (outdoor areas where farm animals are raised)?

• eroded soil

• carbon dioxide

• animal waste matter

• fertilizer

A development in a suburban area near a river will be most affected by pollutants from sources located where?

• downstream from the development (below it)

• the development won't be affected by pollution

• upstream from the development (above it)

• the development itself