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Grades 9-12

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Article, Online Resource

Inge Lehmann: Discoverer of the Earth's Inner Core

Each one of the thousands of earthquakes that occur every year offers a brief glimpse of what's happening deep inside the Earth. Lehmann used seismic signals to change our knowledge of the Earth's core.

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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.

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Science Bulletin

The Last Wild Horse: The Return of Takhi to Mongolia

This feature depicts the emotional reintroduction of Takhi to their last known home range in Mongolia's Gobi desert. The Takhi, also known as Przewalski's horse, is the last surviving horse species that has never been domesticated. An important national symbol for Mongolians, the Takhi also serves as an important case study for conservation biologists who struggle to support the viability of thousands of species on the verge of extinction.

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.

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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.

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