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Photo of the Day

April 30, 2001

Beacon Valley Frost, Antarctica, 1998

Photograph by Maria Stenzel

"A giant jigsaw puzzle of stone and soil shaped by frost paves Beacon Valley. The age of volcanic ash here shows little has changed in millions of years. 'Antarctica holds the answers,' says geologist Dave Marchant, who seeks clue to Earth's past. 'They're just hidden.'"

—From "Timeless Valleys of the Antarctic Desert," October 1998, National Geographic magazine