Human Impact

1. What are renewable resources?

• . Resources that are used faster than they form

• resources that can replenish themselves over time

• resources that formed over millions of years

• resources that exist only in rural areas

According to the graph, what material’s recycling would reduce the largest portion of America’s trash?

• Metals

• paper

• plastics

• Yard trimmings

1. Which of the following is not a renewable resource?

• coal

• wind energy

• solar energy

• water

What is global warming

• the normal temperature fluctuations of Earth's climate cycle

• the melting of the polar ice caps

• the trend of increasing temperatures on Earth

• the changes in Earth's biosphere that affect the atmosphere

1. What is one of the greatest threats to biodiversity on Earth?

• habitat destruction

• loss of drinking water

• decrease in food supply

• pollution

1. Why might an introduced animal species overrun native species in an ecosystem?

• . Its population size is smaller than those of native species.

• . It is more energy efficient, so it eats less food.

• It is a predator of the native species.

• It often has no natural enemies

1. What does the Endangered Species Act do?

• It provides food for endangered species.

• It protects organisms that are near extinction and their environments

• It protects populations of animals from predators

• It protects endangered plant species only.

Which term describes the practice of managing resources so that current needs are met without harming future generations?

• species introduction

• sustainable development

• habitat fragmentation

• biomagnification

New fuels are being produced by converting corn and grasses into compounds containing alcohols that can be broken down for energy in various engines. The purpose of this research is to

•  reduce the use of nonrenewable resources.
• increase the rate of air pollution.
• reduce the rate of homeostasis in organisms.
•  cause a loss of biodiversity in the rain forests.

DDT and other pesticides used over 50 years ago are still affecting the environment today. Scientists have found these substances in recent glacier runoff. Glacier runoff occurs during the summer, when precipitation that has fallen on glaciers during the winter is released. Ice layers from existing glaciers have been analyzed. The results of this analysis show that the concentrations of DDT and other pesticides were highest about 10 years after the use of these substances was banned. This information shows that

• DDT and other pesticides cause glacier runoff during the summer.
• it takes humans over 50 years to analyze a glacier.
• precipitation helps to break down pesticides.
• the decision of one human generation may have an impact on future generations.