Question

17. Which element makes up the greatest % of the Earth's crust? a. potassium K b. sodium Na c. oxygen O d. hydrogen H e. silica

Answer 1

Answer:

c. oxygen

Explanation:

Oxygen -

The most abundant element of the Earth's crust is the oxygen , which constitutes to 46.6 % .

Oxygen is mainly found in the combined form as , phosphates , carbonates .

It has many application in the field of medicine , industries and commercial purpose .

In hospital it is used for the treatment of respiratory diseases .

Hence , the most abundant element on planet earth is c. oxygen  .