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

💡 Solution & Explanation

Aluminum constitutes approximately eight percent of the Earth's crust by mass, making it the most abundant metallic element, followed closely by iron. While oxygen and silicon are more abundant overall, they are classified as non-metals and metalloids respectively, rendering aluminum the top metallic choice. This elementary geological fact is a standard staple of earth science multiple-choice questions.