Which of the following is present in the largest amount in terms of percent by mass in the Earth’s Crust?

Q. Which of the following is present in the largest amount in terms of percent by mass in the Earth’s Crust?
Answer: Oxygen
Notes: Oxygen is most abundant element in the Earth's crust, making up 46% of mass. Oxygen is a highly reactive element that combines with other elements and thus forming various oxides.