Question

Consider the model of the oxygen cycle on Earth. The majority of Earth's oxygen reservoirs are found in the

Answer 1

Answer:

The major oxygen reserves present on earth are:

1. Atmosphere: Around 21 percent of the oxygen by volume is present as free oxygen. Other oxygen-containing molecules include ozone, water vapors, carbon dioxide, oxides of sulfur and nitrogen.
2. Biosphere: Around 22 percent of the oxygen by volume is present as the composition of organic matter and water molecules.
3. Hydrosphere: Around 33 percent of the oxygen by volume is present in the hydrosphere. It is present in the form of dissolved oxygen, components of water molecules and carbonic acids.
4. Lithosphere: Around 47 percent of the oxygen by volume is present as oxide minerals such as silica minerals et cetera.

Answer 2

Atmosphere 
biosphere
hydrosphere
the main oxygen cycle is photosenthisis