by 
Anonymous
ANSWERS: 1
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The mass of the Earth...is composed mostly of iron (32.1%), oxygen (30.1%), silicon (15.1%), magnesium (13.9%), sulfur (2.9%), nickel (1.8%), calcium (1.5%), and aluminium (1.4%); with the remaining 1.2% consisting of trace amounts of other elements. Source: http://en.wikipedia.org/wiki/Earth#Chemical_composition
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