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Ice core
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=== Physical properties === In addition to the impurities in a core and the isotopic composition of the water, the physical properties of the ice are examined. Features such as crystal size and [[Crystal axis|axis]] orientation can reveal the history of ice flow patterns in the ice sheet. The crystal size can also be used to determine dates, though only in shallow cores.<ref>{{cite journal|last1=Okuyama|first1=Junichi|last2=Narita|first2=Hideki|last3=Hondoh|first3=Takeo|last4=Koerner|first4=Roy M.|title=Physical properties of the P96 ice core from Penny Ice Cap, Baffin Island, Canada, and derived climatic records|journal=Journal of Geophysical Research: Solid Earth|pages=6β1β6β2|date=February 2003|volume=108|issue=B2|doi=10.1029/2001JB001707|bibcode=2003JGRB..108.2090O|doi-access=free}}</ref>
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