Chapter 2, Section 3
Bodies of Salt water
70 percent of the earth's surface is water, but the most percentage it is salt water. Geographers divide the four enormous oceans that circle the Earth. The Pacific, the Atlantic, the Indian , and the Arctic. The pacific is one of the largest, it covers more area than all the earth's land combined.
97 percent of the worlds water is found in oceans, but most of it its too salty to drink and to use for other goods. People today are putting great effort into desalination, this process is still in the early stages of development, and because desalination is expensive, only a small amount of freshwater is gained this way.
It's freshwater which lies beneath the earths surface, comes from rain and melted snow that filter through the soil and from water that seeps into the ground from lakes and rivers. An underground porous rock layer often saturated with water in the form of streams is called an 'aquifer'. Aquifers and groundwater are important sources of freshwater.