Unit 4: Lesson 3: Water, Air, and Land Resources Assessment 1-7, p. 108

Which of the following is a nonpoint source pollution of water: rainwater pouring from an eroded bank into a river, a boat emptying a wastes tank into a lake, or a sewage plant sending sewage into a river through pipe?

rainwater pouring from an eroded bank into a river

What do Earth's land resources provide?

soil, forests, mineral, and energy resources

How would Earth be different if there were no greenhouse gases?

Earth would be too cold to sustain life.

Why is fresh water a vital resource?

People need fresh water for drinking, cooking, bathing, and growing food.

What is the difference between point source pollution and nonpoint source pollution?

Point source pollution has a known and specific location. Nonpoint source pollution does not have specific point of origin.

How would the removal of sulfur from coal affect the type of air pollution in a local area? Explain your answer.

Removing sulfur from coal would decrease the amount of sulfur oxides in the air. Sulfur oxides combine with water vapor to form acid precipitation, so the acidity of the precipitation both locally and in more distant areas would decrease.

Why is the chemical composition of Earth's atmosphere important?

The chemical composition of Earth's atmosphere helps to maintain life on Earth.