Answer:
The highest amount of oxygen will be found in soils containing large amounts of gravel.
Step-by-step explanation:
The gases present in the atmosphere like carbon dioxide, nitrogen, oxygen, etc are also present in the soil, but in different proportions. The proportions of different gases in the soil depend on the soil water content, soil texture, soil structure, etc. Bare and dry soils, as well as soils having a coarse texture and well-aggregated structure, have high oxygen content.
Gravels are fragments of rocks that have a coarser texture than sand. Silt and clay have a finer texture than gravel. So, the air permeability is more in gravels as they are loosely arranged and have a coarse texture. As a result, the oxygen content is high in soils containing large amounts of gravel.