What is the most abundant element in the earth's crust?

Strange, isn't it?

Much to the surprise of many people, the most abundant element in the earth crust is Oxygen at 46.1%. The second most common element is Silicone at 28.2%. The third most common element is Aluminum at 8.23%. The fourth most common element is Iron at 4.15% and the fifth most common element is Calcium at 2.82%. These 5 most common elements comprise 89.5% of the earth's crust.