Human Impact Review

Which of the following is one way that we can preserve water resources?

• Leave the water running while you are washing dishes or brushing your teeth

• Only do laundry on certain days even if you don’t have full loads

• Take shorter showers

• Set your irrigation systems on timers so they only water at certain times, rain or shine

Several factors can lead to soil erosion. Which of these human activities is most likely to contribute to soil erosion?

• Clearing land for farming

• Planting trees and vegetation

• Preserving land as a wildlife habitat

• Reducing the amount of livestock in an area

Humans need fresh, clean water to survive. Which of these claims is true about fresh water?

• An unlimited amount of fresh water is available on Earth

• In some places on Earth, fresh water is being used up faster than it can be replaced.

• The global population is currently decreasing, and people are using less fresh water.

• Fresh water was once considered a renewable resource, but today it is considered an inexhaustible resource.

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?

• Dust Storms

• Volcanic Ash

• Industrial emissions

• Forest fires caused by lightning

Pollution is

• Harmful materials being introduced into the environment

• Beneficial materials being introduced into the environment

• Harmful and beneficial materials being introduced into the environment

Which is the best way to manage the use of trees?

• cut down most of the trees from forests

• plant a tree each time one is cut down

• recycle less paper

• build more lumber mills for cutting up trees into wood

The process of a species disappearing forever

• biosphere

• natural habitat

• extinction

• population

• species

The place where an organism naturally lives and grows

• biosphere

• natural habitat

• extinction

• population

• species

The sum of all living matter on Earth

• biosphere

• natural habitat

• extinction

• population

• species

Students decide to remove the litter from an abandoned park and plant trees. Which of the following observations provides the best evidence that the action of the students has had a positive effect on the health of the park ecosystem?

• The number of human visitors decreases.

• The level of yearly precipitation increases.

• The number and diversity of animals increases.

• The average daily high temperature decreases.