questionedithistorytranslationsCurrent version This is the accepted version. added by globalquiz.org July 19, 2012, 12:06 p.m. What is the most common element (by mass) forming the planet Earth? carbonoxygenironsiliconIron is most abundant in the Earth's outer and inner core, and it is the fourth most common element in the Earth's crust.globalquiz.orgShare and bring new players to the game!0Very uninterestingToo difficultPoorly writtenIncorrect or questionableCorrect this question0Very interesting!reach: rather globalastronomychemistryEarthelementsgeologytechnologyVotes Acceptable globalquiz.org