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ANSWERS: 3
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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. O2.
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This looks like a homework question. So, I am going to give you some hints rather than tell you the answer. However, when you get to the answer, you are probably going to be kicking yourself for not seeing it in the first place. Okay, here are the hints in the form of questions. Answer them and you will have your the answer to your question. 1. When looking at the Earth from space, what is the most obvious feature of the Earths surface? What covers 71% of the Earth's surface (http://veimages.gsfc.nasa.gov/7130/world.topo.200407.3x5400x2700.jpg)? 2. What is by far the most common compound in this feature? 3. What is the chemical formula of that substance.
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It's water. H2O.
Moongrim 
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