500
The total surface area of the earth is 5.1 x 10^8 km sq. All the salt water on Earth has an approximate surface area of of 352,000,000 km sq., and the fresh water has an approximate surface area of 9 x 10^6 km sq. How much of the Earth’s surface is covered by water, both freshwater and saltwater?
What is 3.61 x 10^8 km sq.