Frozen
Glaciers and ice sheets sometimes give up their secrets centuries later. Thawing ice has revealed the bodies of people who fell into crevasses hundreds of years ago. The ice has preserved their clothes and their internal organs. Even more astonishing are the bodies of mammoths found occasionally in the permafrost under Alaska and Siberia. Scientists are trying to extract their DNA so they can study these extinct beasts in minute detail.
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How big are icebergs?
Some icebergs are bigger than an entire country. The biggest iceberg ever recorded was larger than Belgium, with an area of 31,000 sq km. These giant icebergs break away from the polar ice sheets when the rise and fall of the tide crack the ice.
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