A study of Yellowstone Park's hot springs provides answers to what type of life evolved and survived when the earth was much hotter billions of years ago.
Encyclopedia Britannica, 331 N. LaSalle St., Chicago, IL 60610, Phone: (312)347-7159, Toll-free: 800-323-1229, Fax: (312)294-2104, URL: http://www.britannica.com
Available on VHS
Running time 15 minutes.
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