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1.
About how much of the world's top soil has been lost to erosion since 1950?
2.
What year did the United States establish the world's first national park?
3.
What international organization, founded in 1961, has worked in over 100 countries to protect hundreds of plant and animal species and their habitats?
4.
What marine biologist called public attention to the wasteful and destructive use of pesticides and warned that the chemicals poison the food supply of animals and kill many birds and fish?
5.
What do scientists call species that require direct human protection for survival?
6.
What zoologist became known for her work with chimpanzees and her efforts to ensure their survival in the wild?
7.
What U.S. president established the first federal wildlife refuge?
8.
According to conservation experts, what condition poses the greatest threat to the survival of wild species?
9.
What did the U.S. government do in 1973 to protect endangered and threatened wildlife and plants from hunting, collecting, and other activities that harm them or their habitats?
10.
What naturalist influenced the U.S. Congress to pass the Yosemite National Park Bill, establishing both Yosemite and Sequoia national parks?
