1 In recent years, the U.S. has seen a number of winter storms that have caused surprisâ¦. 2  The Periodic Table of Elements Life is sustained by a number of chemical elements. 3  They are responsible for the birth of planets and the evolution of cells to complex organisms.
Water distribution on Earth - Distribution of saline and fresh water. 1  The total volume of water on Earth is estimated at 1.386 billion kmÂ³ (333 million cubic miles), with 97.5% being salt water and 2.5% being fresh water. 2  The total volume of water in rivers is estimated at 2,120 kmÂ³ (510 cubic miles), or 2% of the surface fresh water on Earth.
Dear Robert, More than 80 percent of the population of the Chicago metropolitan area receives water from Lake Michigan, yet little thought is given to the salt content of that water. In more understandable terms, Swenson says one cubic foot of sea water, when evaporated, yields 2.2 pounds of salt. However, one cubic foot of freshwater from Lake Michigan contains only 0.01 pound of salt. The oceans are 220 times saltier than the waters of Lake Michigan.