Journey to the Sonoran Desert in southern Arizona with this seventh-grader for an up-close and personal look at the saguaro cactus, which can live about 200 years and grow to be almost 80 feet tall.

What's a high school chemistry teacher from Florida doing in Antarctica studying the winds? She's helping researchers understand global warming by tracking how the winds transport snow.

It takes only about a month for any change in Antarctica's weather to be felt in North America—pretty remarkable when you consider that Antarctica is 12,874 kilometers (8,000 miles) away.

With most of its rocks buried and completely unknown, Antarctica is the last continental frontier. Go with Finn under the ice to find out how Australia and Antarctica once fit together.

The weather station names paint quite a picture of Antarctica—Penguin Point, Ski-Hi, and Windless Bight. Which one would you guess had the lowest temperature? And what month was it recorded in?

For three months in the early 1800s, earthquakes shook two pioneer towns in Missouri—and permanently changed the course of the Mississippi River. Relive that time with this 12th-grader from Wisconsin.

About 390 million years ago, the warm, shallow Catskill Sea covered New York State. As the water retreated, it left layers of sedimentary rock and fossils, as this 12th-grader discovered.

The area surrounding the Huntington Formation is very rich in geologic history, yet it is undocumented and hasn't been mapped in detail. But that didn't stop this 11th-grader from Idaho from surveying its terrain.

After 200 years and the mining of 106 million tons of iron, the Cornwall iron mine was closed. Yet, as this 10th-grader from Pennsylvania argues, the site's geologic importance is far from over.

Traverse the geologic history of Pikes Peak and the southern Rocky Mountains—from Precambrian foundation to roughly contoured summits—with this 12th-grader from Colorado.