Question

Which is the second most abundant gas in Earth's atmosphere?

• A. Hydrogen
• B. Oxygen
• C. Nitrogen
• D. Carbon di oxide

Answer 1

Answer:

B. Oxygen

• The atmosphere is the layer of air that surrounds the Earth.

• Earth's gravity pulls it closer to the Earth's surface.

• The three main components of the atmosphere are nitrogen, oxygen, and argon.

• The atmosphere is made up of many different gases.

• The two primary gases in the atmosphere are nitrogen and oxygen, which make up 99 percent of the atmosphere.

• The remaining gases in the atmosphere include argon, carbon dioxide, neon, helium, hydrogen, and others.

• The proportions of the gases change as you go higher in the atmosphere.
  

Permanent gases in the atmosphere and their abundance

• Nitrogen - 78.08 %

• Oxygen - 20.95 %

• Argon - 0.93 %

• Carbon dioxide - 0.036 %

• Neon - 0.002 %

• Helium - 0.0005 %

• Krypton - 0.001 %

• Xenon - 0.00009 %

• Hydrogen - 0.00005 %