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Grades 9-12

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Article

Zircon Chronology: Dating the Oldest Material on Earth

The mineral zircon serves as a tiny time capsule, recording geologic events—it's especially useful because the oldest discovered grains (4.2 billion to 4.3 billion years old) are not much younger than the Earth itself.

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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.

Charlotte-Hoover

Young Naturalist Awards Essay

Aquarium: An Ecosystem in Miniature

In a 29-gallon fish tank, this ninth-grader from Virginia created a tropical freshwater ecosystem—and then watched how fish that could never meet in nature interacted. A 2003 Young Naturalist Award-winning essay.

doug2

Young Naturalist Awards Essay

Arsenic and Zinc Distributions in Streams Near Park City, Utah

How safe is the drinking water in your town? This 10th-grader from Utah decided to test water samples to find out the answer for himself. Then, he devised a creative way to improve surface water. A 2003 Young Naturalist Award-winning essay.

elspeth8

Young Naturalist Awards Essay

Aspen Island

2003 Young Naturalist Award-winning essay - "Some plants don't seem to notice the change in weather, but others, like the aspen, have a new outfit for each season," writes this 10th-grader from New Mexico in her winning Young Naturalist essay.

linda1

Young Naturalist Awards Essay

Worms in Prospect Park, Brooklyn

2003 Young Naturalist Award-winning essay - Did you know that earthworms migrate during the winter? Find out where they go—and other fascinating details—as this eighth-grader from New York examines their underground world.

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