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?

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?

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?

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?

The process of humans cutting down trees is called

Reforestation is the planting of trees that have been cut down by loggers and builders. One benefit of reforestation is restoring lost trees, which future generations can use for their wood. How else could reforestation benefit a community?

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?

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?

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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