Human Impact

There are many sources of air pollution in the United States and around the world. Some are natural sources, and others come from humans. Which of these examples is a human source of air pollution?

Erosion is the process by which soil and sediments are moved by gravity, wind, and water. Erosion occurs naturally, but it can be accelerated by human activity. Which of these human activities most contributes to soil erosion?

What effect has urbanization had on air pollution in the United States and around the world?

Urbanization has led to an increase in air pollution around the world. Which of the following BEST explains why urban areas have more air pollution that rural areas do?

When forest land is cleared for human use, the loss of trees can lead to other changes to Earth’s surface. Which of the following processes is most likely to occur after land has been cleared of its trees?

Smog is a pollutant that can cause serious health problems. Smog is most often seen over large cities. Which of these substances is a main ingredient of smog?

Erosion is the process by which soil and sediments are moved by gravity, wind, and water. Erosion occurs naturally, but it can be accelerated by human activity. Which of these human activities most contributes to soil erosion?

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