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Grades 3-5

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Online Resource

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?

Saving-Species

Story

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.

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Interactive

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. 

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Story

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

Interactive

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.

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Interactive

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.

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Story

What's the Big Idea About Astronomy?

Huge distances, gigantic sizes, and long periods of time—astronomy is a BIG subject. We've brought learning about it down to size with this look at the big ideas you need to know. 

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Young Naturalist Awards Essay

Oscawana: A Dying Lake?

2003 Young Naturalist Award-winning essay - Oscawana has all the symptoms of a dying lake. Join this seventh-grader from New York as she hunts for the culprits—and examines what can be done to restore the lake.

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Activity

Mint Your Own Coin

That change jangling in your pocket is more than money—it's a record of where and when you live. Find out why coins are valuable clues for archaeologists. Then, design your perfect coin. 

What-Do-You-Know-about-Astronomy

Interactive

What Do You Know about Astronomy?

How much do you really know about our place in space? Test your astronomy knowledge with this interactive quiz. Don't worry, there's no grading—just a helpful look at the answers when you're done! 

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American Museum of Natural History

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