If you've ever heard the phrase "don't bite the hand that feeds you," you'll know exactly what today is about.

In the spirit of Earth Day, people from all over the world are demonstrating their support for environmental protection.

We know you love your Earth, but how much do you know about it?

1. What year was considered the birth of the modern environmental movement?

A. 1981

B. 1970

C. 1956

2. What book set the stage for change by raising public awareness and concern for living organisms, the environment and public health?

A. Rachel Carson: Silent Spring

B. Jared Diamond: The Collapse

C. Upton Sinclair: The Jungle

D. Dr. Seuss: The Lorax

3. The founder of Earth Day, U.S. Sen. Gaylord Nelson, was from what state?

A. California

B. New York

C. Wisconsin

4. What environmental tragedy sparked a push for environmental protection?

A. Massive oil spill in Santa Barbara, California (1969)

B. The Donora Smog (1948)

C. Deepwater Horizon Gulf Oil Spill (2010)

5. The first Earth Day led to the creation of the United States Environmental Protection Agency and, eventually, which acts?

A. Clean Air Act

B. Clean Water Act

C. Endangered Species Act

D. All of the above

6. Which of these two fuel efficiency ratings indicates that the car uses less gasoline?

A. 52 miles per gallon

B. 10 miles per gallon

7. Two 50-watt bulbs produce the same amount of light as one 100-watt bulb.

A. True

B. False

8. The world's first national park was started in 1872 in which country?

A. Corbett National Park in India

B. Ordesa National Park in Spain

C. Yellowstone National Park in U.S.

9. Where was the first major international conference on environmental issues?

A. United States

B. Britain

C. China

D. Sweden

10. What year did Earth Day become an international holiday?

A. 1990

B. 1981

C. 1976