In which two Earth regions is oxygen the second most abundant element by volume?

Oxygen is the second most abundant element by volume in the ;

The regions of the Earth that has oxygen as the second most abundant element are :

Hydrosphere : This is the region of the earth that is composed mainly of water and oxygen but the major part of the hydrosphere is water while the oxygen is the second most abundant element.

Troposphere : This is the lowest part of the atmosphere which comprises of about 75% of the atmosphere and it contains about 78% Nitrogen and 21% of oxygen.

Hence we can conclude that Oxygen is the second most abundant element by volume in the Hydrosphere and Troposphere.

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By volume, oxygen is the second most abundant element in the hydrosphere and troposphere. The troposphere is the lowest part of Earth's atmosphere which is nothing but air, and the hydrosphere is made up of the Earth's water which is full of oxygen at any given moment.

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