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ZNetwork on MSNWhy We Should Pay Attention to Gerta Keller’s Battle with the Alvarez Impact TheoryI am hiking along the Metacomet Ridge in Greenfield, Massachusetts – a rather steep basaltic structure, modestly less than five hundred feet high and topped by a stately brick tower constructed in ...
In the end, over 90 per cent of marine life and 70 per cent of land animals were wiped out in the single worst extinction ...
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