To return to the chapter summary click Escape or close this document. Chapter Resources Click on one of the following icons to go to that resource. earth.msscience.com Image Bank Foldables Video Clips and Animations Standardized Test Practice Chapter Review Questions Chapter Summary

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To return to the chapter summary click Escape or close this document. Image Bank Table: Population Growth of Modern Humans

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To return to the chapter summary click Escape or close this document. Foldables How Human Activities Impact Land Make the following Foldable to help identify what you know, what you want to know, and what you learned about how humans impact land.

To return to the chapter summary click Escape or close this document. Foldables Fold a vertical sheet of paper from side to side. Make the front edge about 1.25 cm shorter than the back edge.

To return to the chapter summary click Escape or close this document. Foldables Turn lengthwise and fold into thirds.

To return to the chapter summary click Escape or close this document. Foldables Unfold and cut only the top layer along both folds to make three tabs.

To return to the chapter summary click Escape or close this document. Foldables Label each tab as shown.

To return to the chapter summary click Escape or close this document. Foldables Before you read the chapter, write what you already know about the impact of human activities on land under the left tab of your Foldable, and write questions about what you’d like to know under the center tab. As you read the chapter, list what you learned under the right tab. Identify Questions

To return to the chapter summary click Escape or close this document. Video Clips Click image to view movie.

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To return to the chapter summary click Escape or close this document. 1 1 Reviewing Main Ideas Modern medicine, clean water, and better nutrition have contributed to the human population explosion on Earth. Population Impact on the Environment Earth’s resources are limited. Our daily activities use resources and produce waste.

To return to the chapter summary click Escape or close this document. 2 2 Reviewing Main Ideas Land is used for farming, grazing livestock, lumber, development, and disposal. Using Land Farming and development are ways that using land can impact the environment. Using forest resources can impact organisms and Earth’s climate.

To return to the chapter summary click Escape or close this document. 2 2 Reviewing Main Ideas Plants are sometimes used to break down and absorb pollutants from contaminated land. Using Land New technologies have reduced greatly the need for hazardous waste disposal. One way to preserve our land is to set aside natural areas.

To return to the chapter summary click Escape or close this document. 3 3 Reviewing Main Ideas Recycling, reducing, and reusing materials are important ways to conserve natural resources. Conserving Resources Reducing, reusing, and recycling has decreased the amount of trash deposited in landfills since Different methods can be used to encourage recycling.

To return to the chapter summary click Escape or close this document. Chapter Review Question 1 A substance that contaminates the environment is a __________. A. compost B. development C. groundwater D. pollutant

To return to the chapter summary click Escape or close this document. Chapter Review Answer The answer is D. Part of conservation is reducing the amount of pollutants in the environment.

To return to the chapter summary click Escape or close this document. Chapter Review Question 2 Which of these is the largest number of individuals of a particular species that the environment can support? A. carrying capacity B. community C. habitat D. population

To return to the chapter summary click Escape or close this document. Chapter Review Answer The answer is A. Population size depends on the resources available.

To return to the chapter summary click Escape or close this document. Chapter Review Question 3 An area where garbage is deposited and covered with soil is a __________. A. hazardous waste site B. phytoremediator C. sanitary landfill D. recycling plant

To return to the chapter summary click Escape or close this document. Chapter Review Answer The answer is C. Sanitary landfills are designed to prevent the deposited garbage from blowing away, as well as prevent liquid waste from entering groundwater.

To return to the chapter summary click Escape or close this document. Chapter Review Question 4 Substances that make chemical reactions go faster are ___________. A. compost B. enzymes C. hazardous D. nutrients

To return to the chapter summary click Escape or close this document. Chapter Review Answer The answer is B. Some plant roots release enzymes into the soil and increase the rate at which organic pollutants are broken down.

To return to the chapter summary click Escape or close this document. Chapter Review Question 5 What is a natural preserve? Answer Natural preserves are areas of land set aside in the form of national parks, forestlands, and grasslands.

To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 1 During what time period did human population increase the most?

To return to the chapter summary click Escape or close this document. Standardized Test Practice A B C D

To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is D. The population increased by over 3 billion during this time period.

To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 2 What was the population in the year 1900 A.D.? A. 600 million B. 1 billion C. 1.6 billion D. 6.1 billion

To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is C. The population had not yet grown to 2 billion.

To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 3 Which of the following has the least forested land? A. Africa B. Asia C. Australia D. Europe

To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is C. Australia does not appear on the graph showing the distribution of the world’s forests.

To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 4 The two areas having the largest percentages of Earth’s forested lands account for how much of the total? A. 27.5% B. 30.4% C. 32.3% D. 54.5%

To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is D. Latin America and Europe combined have 54.5% of Earth’s forested land.

To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 5 What process does the diagram illustrate? A. composting B. deforestation C. phytoremediation D. recycling

To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is C. During phytoremediation, roots of plants absorb contaminants from soil.

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