Search from various English teachers...
xiaokaoy
'c. 635–542 Ma' - Does "c." mean "circa" or "about"? What does "Ma" in the phrase mean? Is it the same as "BC"?
Jun 13, 2012 1:21 AM
Answers · 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.
June 13, 2012
Still haven’t found your answers?
Write down your questions and let the native speakers help you!

Don’t miss out on the opportunity to learn a language from the comfort of your own home. Browse our selection of experienced language tutors and enroll in your first lesson now!

xiaokaoy
Language Skills
Chinese (Mandarin), English
Learning Language
English
Articles You May Also Like
English Vocabulary for Using Microsoft Office at Work
26 likes · 6 Comments
How to Answer “How Was Your Weekend?” Naturally in English
56 likes · 30 Comments
Why Some Jokes Don’t Translate: Understanding Humor in English
15 likes · 6 Comments
More articles