Courtesy US Geological SurveyThis cool graphic from the USGS Water Science School website gives you a really good idea of just how much water there is on Earth. Compared to the Earth itself, it doesn't look like much. The large blue globe represents the volume of all the water present on Earth, i.e. in the oceans, lakes, icecaps, atmosphere etc. The next size is the volume of the all fresh water - much of which is located underground. Don't overlook the very tiny blue globe positioned beneath the mid-sized water globe and just northwest of Florida in the graphic. That's how much fresh water is contained in all the lakes and rivers on Earth - the sources of life's drinking water. Feeling thirsty now?