After oxygen, which is the most common element on Earth?
by 
Becool1935
ANSWERS: 7
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Hydrogen, both of which can be found in the huge cavernous space between your ears...
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water
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Carbon.
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Actually, iron is more common than oxygen when measuring by mass.
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Silicon
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Im sorry to say but that would be silicon... Silicon is the second most common element on earth. It is in over 90% of the worlds crust. The reason it is the second most common element is because it likes to form a tetrahedra with oxygen. Tetrahedra like are even easier to bond forming chains double chain, and sheets.
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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.
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