The McMurdo Dry Valleys, the largest ice-free area in Antarctica, is among several test sites targeted by Ohio State University researchers who will use NASA's Ice, Cloud, and land Elevation Satellite (ICESat) to map Earth's ice sheets. The researchers will choose and characterize several sites on the Earth's surface that NASA will use to calibrate ICESat's instrumentation. Scientists here hope to determine if the sheets are growing or shrinking. Photo by Earle Holland, courtesy of Ohio State University.

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