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stagnant ice over the Turtle Mountains melted, the debris it contained gradually became concentrated at the surface of the ice, resulting in an increasingly thick insulating layer that greatly retarded the rate of melting. Thus, even though the glacier stopped moving and stagnated over the Turtle Mo...
| Language: | unknown |
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| Online Access: | http://cdm16921.contentdm.oclc.org/cdm/ref/collection/ndbb/id/13298 |