On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
Some scientists say that the major building block of the universe is hydrogen because it's the most plentiful element, but my theory is that the universe is made out of stupidity, because it is more plentiful than hydrogen.
Author: Fred Senese firstname.lastname@example.org
Copyright © 1997-2010 by Fred Senese
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Last Revised 08/17/15.URL: http://antoine.frostburg.edu/chem/senese/101/periodic/faq/print-what-element-is-most-abundant.shtml