Question

Which element is most abundant in the earth crust?

Answer 1

Most abundant in the earth crust:

• The outer side known as crust covers the planet.
• The most abundant element in the earth’s crust is oxygen (46. 1%).
• The chemical formula of oxygen (dioxygen) is O₂.
• This formula is given so because oxygen usually combines with another oxygen by forming a covalent bond.

Composition of the atmosphere – Oxygen

• The atmosphere is composed of 21% oxygen.
• It is used by all living things and is essential for respiration.
• It is obligatory for burning.
• Oxygen is essential for breathing and it is used in all the living organism in the planet.