science

all of the following are explanations for glacial periods EXCEPT.

a. varying solar energy
b. volcanism
c. biological organisms
d. Earth's orbit's precession

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asked by alex
  1. Volcanoes might end an ice age.
    This might be of interest:
    http://news.sciencemag.org/earth/2012/07/did-marine-snot-cause-ice-ages

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    posted by Damon
  2. ;,

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