Oxygen makes up 21 percent of Earth's atmosphere.
Freshwater makes up about 2.5% of the total water on Earth, while saltwater makes up about 97.5%.
Water makes up approximately 70% of Earth's surface.
Nitrogen
80%
Nitrogen makes up almost 80 percent of air. Oxygen makes up about 21 percent, with the remaining 1 percent made up of various gases such as carbon dioxide, argon, and others.
Oxygen makes up 21 percent of Earth's atmosphere.
Freshwater makes up about 2.5% of the total water on Earth, while saltwater makes up about 97.5%.
Nitrogen is the gaseous nonmetal that makes up 78 percent of Earth's atmosphere.
Nitrogen
75%
Water makes up approximately 70% of Earth's surface.
Nitrogen
80%
Water makes up about seventy five percent of the Earth's surface.
Oceans
32%