Question

In which form oxygen in the
found in the earth's crust ?​

Answer 1

Explanation:

Some other forms of oxygen are also found in the combined state. In Earth's crust, it is found as the oxides of most metals and silicon and also as carbonate, sulphate, nitrate and other minerals. In other forms, it is the part of biological molecules like carbohydrates, proteins, fats and nucleic acids, etc.