This two-minute sound segment explains how past climate changes can be determined by the study of ice cores. These ice cores are cylinders drilled out of the sheets of ice covering Greenland and Antarctica and are about eight inches in diameter and up to a mile and a half deep. Some of the ice is 400 thousand years old and is turning out to be a valuable historical record. Scientists are also finding environmental clues in the ice cores, trapped inside air bubbles. This site is from an archive of a daily radio program called Pulse of the Planet, which provides its listeners with a portrait of Planet Earth, tracking the rhythms of nature, culture and science worldwide and blending interviews and extraordinary natural sound. The site also provides a written transcript of the broadcast.
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Subject: Geoscience:Hydrology, Atmospheric Science:Climatology Grade Level: General Public, College Lower (13-14), High School (9-12) Topics: Hydrosphere/Cryosphere, Climate, Human Dimensions/Resources
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