Grades 6-8

James Hutton: The Founder of Modern Geology

Online Resource, Article

James Hutton: The Founder of Modern Geology

Until the late 18th century, most people believed the Earth was about 6,000 years old. Hutton changed this belief by proposing that geologic forces operate at the same rate today as in the past.

Reefs in Crisis

Online Resource, Article

Reefs in Crisis

Humans have harmlessly harvested coral reefs for thousands—or even hundreds of thousands—of years. So why has our behavior in recent years suddenly put reefs at risk?

Studying Tree Rings to Learn About Global Climate

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.

Saving Species

Saving Species

Take a world-wide tour of biodiversity. You'll meet mollusks in the reefs off the Bahamas, the aye-aye in the tropical forests of Madagascar, and the clever mimic-ant spider that lives in Australia.

Work the System!

Work the System!

Did you know that forests with leaves above the water can grow in the ocean? Grab the magical magnifying glass, and see how many different plants and animals you can find in this virtual mangrove swamp. 

It Takes All Kinds to Make a World

It Takes All Kinds to Make a World

The ocean's one diverse place—with alga so tiny that 10 million can fit in a single teaspoon to whales longer than three school buses. Take the surfboard challenge, and ride the waves of biodiversity!

Ocean Creature Feature

Ocean Creature Feature

To survive in the icy Pacific, a sea otter has about a million hairs in every square inch of its fur. Now, that's dense! Take a close look at ocean adaptations while boosting your OLogy card collection.

Dive Into Worlds Within the Sea

Dive Into Worlds Within the Sea

Which squirmy little creatures does the spiny lobster eat? Can you spot the weird greenish glow on the belly of the cookie-cutter shark? Show off your good thinking with a game of good linking.

How to Calculate a Biodiversity Index

Article

How to Calculate a Biodiversity Index

One is the riskiest number... A more diverse plant population has a better chance of adapting to changes in the environment. Learn how to quantify the biodiversity of any area.

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