Q. Which element is most prolific in the crust of the earth?
Answer: Oxygen
Notes: Oxygen is the most abundant element in the Earth’s crust, making up 467,100 ppm (parts per million) of the Earth’s crust, or 46.6%. It exists as a major compound of the silicate minerals where it combines with other elements. It also exists as a compound in carbonates and phosphates. Silicon is the second most common element pre-sent in the crust with an abundance of 276,900 ppm (27.7%).