Which element is the most abundant by mass in the Earth's crust?

💡 Solution & Explanation

Oxygen is the most abundant chemical element by mass in the Earth's crust, accounting for approximately forty-six percent of its total composition, largely combined in silicate minerals. While silicon is also highly prevalent, it ranks second behind oxygen in crustal abundance by mass. Questions regarding elemental abundances in the lithosphere form a standard part of physical geography and general science syllabi.