All the Air and Water in the World

"He hath made the earth by his power, he hath established the world by his wisdom, and hath stretched out the heavens by his discretion." ~ Jeremiah 10:12

I found this picture at a site entitled The Thinking Blogger. Allegedly, this is all of the air and water in the world drawn to scale and shown next to the earth. On the left, you see all of the air in the world (5,140 trillion tonnes) gathered into a ball at sea-level density. On the right, you see all of the water in the world (1.4087 billion cubic kilometers) which includes sea water, ice, lakes, rivers, ground water, clouds, etc.

At first, I thought that the water seemed way too small. After all, isn't the earth 70% water. However, I heard a great explanation. The earth is not 70% water. Stupid me. The earth is 70% covered in water. Water only covers the surface of the earth and compared to the mass of the earth it is relatively small! Very interesting.