Concentration of which element is highest in soil?

✅Explanation:
-Oxygen is the most abundant element in the Earth's crust, and soil is a major component of the crust.
-Oxygen is present in various forms within the soil, primarily as a constituent of silicate minerals (e.g., quartz, feldspar) and metal oxides (e.g., iron oxide, aluminum oxide), as well as in water and organic matter.