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xiaokaoy
'c. 635–542 Ma' - Does "c." mean "circa" or "about"? What does "Ma" in the phrase mean? Is it the same as "BC"?
13 มิ.ย. 2012 เวลา 1:21
คำตอบ · 2
xiaokaoy, The abbreviation for circa is c. or ca. It means the same as "about" or "approximately". "Ma" is an abbreviation for "million years ago". c. 635–542 Ma = approximately 635 to 542 million years ago.
13 มิถุนายน 2012
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