what is the most common element (by mass) forming the planet earth?
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The mass-abundance of the nine most abundant elements in the Earth's crust is approximately: oxygen 46%, silicon 28%, aluminum 8.3%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium 2.0%, and titanium 0.61%.
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oxygen
By mass, oxygen is the most abundant element in the human body.
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