Question

Explain the fact that oxygen is the most abundant element in the earths crust

Answer 1

Answer:

Oxygen is the most abundant element on Earth because oxygen is the third most abundant element in the universe and it is extremely chemically reactive, so it is bound up in all kinds of materials.

Oxygen, O2, is by far the most abundant element in earth's crust at 46.6 percent, nearly half of the mass of the crust.  

Oxygen is a highly reactive element capable of combining with many other elements to form compounds. It readily combines with silicon (Si) to form silicate minerals or with iron (Fe) to form various iron ore compounds.