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.
Approximately 75% of the Earth's surface is covered by saltwater oceans. About 71 percent of the Earth's surface is water-covered, and the   oceans hold about 96.5 percent â¦of all Earth's water. But water  also exists in the air as  water vapor, in  rivers and  lakes, in icecaps and  glaciers, in the ground as soil moisture and in  aquifers, and even in you and your dog.