Today, in the United States, we all generally enjoy adequate supplies of safe, high quality water, not only for drinking but for a wide variety of other purposes. The same water the dinosaurs drank we drink today. This is something about which to be concerned. Because of population demands and pollution, we are impacting this resource beyond its ability to recycle itself. As water flows through streams and rivers and collects in lakes and oceans, much evaporates into the atmosphere.
Some water penetrates the ground and charges underground aquifers.
As every school child knows, the evaporated water eventually forms clouds and falls as precipitation again to replenish the streams, rivers, lakes and ocean. Thus every molecule of water eventually recycles itself. From a human standpoint, certain aspects of this natural cycle can pose problems. When the water returns to earth it can fall in the wrong place at the wrong time. Floods or rain instead of snowpack can be the result.