Question
In what form, oxygen is found in Earth's crust$?$
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Answer
Oxygen is by far the most abundant element in the Earth's crust. Nearly half of all the atoms in the earth are oxygen atoms. Oxygen also makes up about one-fifth of the Earth's atmosphere. Nearly $90$ percent of the weight of the oceans is due to oxygen. In addition, oxygen is thought to be the third most abundant element in the universe and in the solar system. It occurs in the form of oxides in the earth's crust. The discovery of oxygen is usually credited to Swedish chemist Carl Wilhelm Scheele $(1742-86)$ and English chemist Joseph Priestley $(1733-1804).$ The two discovered oxygen at nearly the same time in $1774,$ working independently of each other.
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