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2 answers

Because each winter new snow is added, and this eventually gets compressed and 'lithified' into ice.

2006-08-02 11:46:44 · answer #1 · answered by QFL 24-7 6 · 1 0

It's very similar to the rings in trees. Climate changes and all that.

2006-08-02 16:59:44 · answer #2 · answered by 34th B.G. - USAAF 7 · 0 0

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