What is the most abundant element in Earth’s crust?

The most abundant element in Earth’s crust is oxygen, making up about 46.6% by weight. It combines with other elements like silicon, aluminum, iron, and calcium to form various minerals and rocks. Silicon, the second most abundant element, combines with oxygen to form silicates, which make up a large portion of the Earth’s crust. Oxygen is essential for life and plays a significant role in the formation of the planet’s atmosphere, as well as in many geological and chemical processes.