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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"?
2012年6月13日 01:21
回答 · 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.
2012年6月13日
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