Asked by alex
                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
            
        a. varying solar energy
b. volcanism
c. biological organisms
d. Earth's orbit's precession
Answers
                    Answered by
            Damon
            
    Volcanoes might end an ice age.
This might be of interest:
http://news.sciencemag.org/earth/2012/07/did-marine-snot-cause-ice-ages
    
This might be of interest:
http://news.sciencemag.org/earth/2012/07/did-marine-snot-cause-ice-ages
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