USGS: Science for a Changing World - USGS visual identity mark and link to main Web site at

Glaciers: Clues to Future Climate

By Richard S. Williams, Jr.,

This out-of-print General-Interest Publication has been made available in Portable Document Format.

Crevasses on Le Conte Glacier, Washington

A glacier is a large mass of ice having its genesis on land and represents a multiyear surplus of snowfall over snowmelt. At the present time, perennial ice covers about 10 percent of the land areas of the Earth. Although glaciers are generally thought of as polar entities, they also are found in mountainous areas throughout the world, on all continents except Australia, and even at or near the Equator on high mountains in Africa and South America.

[Photograph: Oblique aerial view of crevasses at an icefall on Le Conte Glacier, Washington.]

This report is stored in Portable Document Format.
Adobe Acrobat Reader is required to view it.
If you already have Acrobat Reader 3.0 (or later) installed
on your computer, click here to download the complete report (769 K).

If you wish to download Acrobat Reader
free of charge, click here.

VIEW a list of other USGS General Interest Publications

U.S. Department of the Interior
U.S. Geological Survey

This page is <URL:>
Maintained by: Publications Services
Last modified 14 October 1999

For more information about this report contact Richard S. Williams, Jr., at