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Grades 9-12

907a

Online Resource, Article

The Green Guerillas

From a humble start 25 years ago tossing seed-filled water balloons into abandoned city lots, the Green Guerillas have grown into an organization that has created and maintains 1,000 urban gardens.

908

Online Resource, Article

Wilderness Preservation Act

There are more than 260 distinct ecosystems in the United States. Yet only a little over half of them are in protected wilderness areas. What does it take to obtain "wilderness status"?

909b

Article

St. Lucia Parrot Recovery

In the mid-1970s, only 100 of these parrots were left in the wild. Learn how an international effort more than tripled the St. Lucia parrot population in 20 years.

909a

Online Resource, Article

Restoration of the Elwha River

In a single century, the salmon population of Washington State's Elwha River shrunk by more than 99 percent. What caused this dramatic decline, and what can be done to turn it around?

911

Online Resource, Article

Lake Victoria

In the world's largest tropical lake, Nile perch have eaten their way through all but one of their prey species, bringing the ecosystem close to death. But don't blame the perch—humans are at fault.

912

Online Resource, Article

Profile: Michael Balick

Around the world, habitats are being destroyed and people are turning away from ancient traditions. Balick is working to make sure that plant wisdom isn't lost in the process.

hot_spring_01

Online Resource, Article

Mapping Hot Springs on the Deep Ocean Floor

At the bottom of the ocean, how do scientists find their way around? This marine geologist's work includes helping to create accurate, high-resolution maps of the sea floor.

rainier_01

Online Resource, Article

Mapping Mt. Rainier

Beneath the glacier-clad summit of Mt. Rainier lies an active volcano, which has more than once produced enough molten rock to bury an area the size of Tacoma and Seattle combined almost 10 feet under.

stromatalite_01

Online Resource, Article

Retrieving a Stromatolite from the Sahara Desert

Why did museum scientists travel to the Sahara to retrieve a boulder? This stromatolite was built by microbes, the only life that existed on Earth until about a billion years ago.

tree_rings_02

Online Resource, Article

Studying Tree Rings to Learn About Global Climate

By taking biopsy-like samples from centuries-old Siberian pines, scientists have reconstructed a 300-year record of temperature changes for the Arctic and the Northern Hemisphere.

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