9EARTH HAS A VERY UNIQUE CHEMICAL COMPOSITION

Planet earth is made up of iron, oxygen, silicon, sulfur, magnesium, sodium, nickel, calcium, and aluminum. While all of these elements are found on other planets they are only found in trace amounts.  

The majority of elements found on other planets are helium and hydrogen. On the contrary, 90% of Earth is made up of iron, oxygen, silicon and magnesium.

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