The principal source of water in the oceans and the atmosphere comes from the process of evaporation. Evaporation is a process when water turns into gas, influenced by the heat, and it moves up in the atmosphere because it is easier then the air. There it creates clouds with the process of condensation, and then it forms rain, snow...
A megalopolis happens when the large cities would merge together that would result the supercity in a megalopolis. Examples would include Washington, Philadelphia, Baltimore, Boston and New York. New York then is the center of the megalopolis. Hope this would help.
<span>The three major rivers which flow through France are the Loire river (the longest at 625 miles long), the Rhone river and the Seine river.</span>