It is unknown, but it is probably a magnesium silicate known as post-perovskite (MgSiO3). It is composed of the prime oxide constituents of the Earth's rocky mantle, magnesium oxide and silicon...
The most common compound is water. Its molecule is made up of two hydrogen atoms and one oxygen atom. Hydrogen is the most common atom in the universe, and oxygen is the thrid most common, so water...
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