Physical representation of all of the water in, on and over the Earth

Inspired by a picture on the USGS website

Each blue sphere is to scale assuming the Earth is a sphere with a radius of 40 cm (15.74 inches). The largest one is all of the water on Earth. The mid-sized sphere is all fresh liquid water and the smallest is lake and river water only. The white base is a slice of a 40 cm sphere (size of the Earth)

More information here