The origin of water on earth or the reason that there is clearly more liquid water on earth than on the other rocky planets of the solar system is not completely understoodthere exist numerous more or less mutually compatible hypotheses as to how water may have accumulated on earths surface over the past 45 billion years in sufficient quantity to form oceans. Typically fresh water is defined as water with a salinity of less than 1 percent that of the oceans ie below around 035 water with a salinity between this level and 1 is typically referred to as marginal water because it is marginal for many uses by humans and animals the ratio of salt water to fresh water on earth is around 40 to 1. The earth is often compared to a majestic blue marble especially by those privileged few who have gazed upon it from orbit this is due to the prevalence of water on the planets surface while . Water on earth is a finite source protecting the water means protecting all forms of the groundwater can be found in aquifers water found on earth water at the surface under the ground in vapor form and as precipitation
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