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Over the edge.

Starting in January, visitors will line up to step off the edge of Arizona's Grand Canyon. But a new glass-bottomed platform will ensure that sightseers won't plummet 1,200 meters (4,000 feet) to the canyon floor below.

The newly built "Canyon Skywalk" will overhang the rim of Earth's largest canyon. "The canyon region began to form about 60 million years ago," says Richard Young, a geologist at the State University of New York at Geneseo. During that time, rock plates that make up Earth's outer layer, or crust, shifted--lifting the region. Millions of years later, the Colorado River began flowing over the uplifted land. Over time, the surging river water eroded, or wore away, the rocks--carving out the canyon. The result for today's visitors: a vertical view with a heart-stopping drop.
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Title Annotation:Grand Canyon
Author:Jango-Cohen, Judith
Publication:Science World
Article Type:Brief Article
Geographic Code:1U8AZ
Date:Dec 12, 2005
Words:132
Previous Article:It's elemental!
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