Question

What is the most common element (by mass) forming the planet Earth?​

Answer 1

Answer:

Iron is most abundant in the Earth's outer and inner core, and it is the fourth most common element in the Earth's crust.

Answer 2

Answer:

The mass-abundance of the nine most abundant elements in the Earth's crust is approximately: oxygen 46%,

silicon 28%,

aluminum 8.3%,

iron 5.6%,

calcium 4.2%,

sodium 2.5%,

magnesium 2.4%,

potassium 2.0%,

titanium 0.61%.

Other elements occur at less than 0.15%.