There are three spheres. 1. All water (largest sphere) 2. All of Fresh water. 3. Fresh water in lakes and rivers. Reference: http://water.usgs.gov/edu/galle

There are three spheres. 1. All water (largest sphere) 2. All of Fresh water. 3. Fresh water in lakes and rivers. Reference: http://water.usgs.gov/edu/gallery/global-water-volume.html http://water.usgs.gov/edu/gallery/global-water-volume.html