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 understood.There exist numerous more or less mutually compatible hypotheses as to how water may have accumulated on Earth's surface over the past 4.5 billion years in sufficient quantity to form oceans
Spheres representing all of Earth's water, Earth's liquid fresh water, and water in lakes and rivers The largest sphere represents all of Earth's water. Its diameter is about 860 miles (the distance from Salt Lake City, Utah, to Topeka, Kansas) and has a volume of about 332,500,000 cubic miles (mi 3 ) (1,386,000,000 cubic kilometers (km 3 )).
The Earth is a watery place. But just how much water exists on, in, and above our planet? About 71 percent of the Earth's surface is water-covered, and the oceans hold about 96.5 percent of all Earth's water. 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.
Water is everywhere, from huge oceans to invisible water molecules making up water vapor in the air. But how much water is there on, in, above, and below the Earth, and where is it located? Use the topics below to explore the basic concepts and facts about water ...
As part of that evolution, the U.S. Geological Survey has become the Federal Government's largest earth-science research agency, the Nation's largest civilian map-making agency, the primary source of data on the Nation's surface- and ground-water resources, and the employer of the largest number of professional earth scientists.
The World's Water "Water, Water, Everywhere...." You've heard the phrase, and for water, it really is true. Earth's water is (almost) everywhere: above the Earth in the air and clouds, on the surface of the Earth in rivers, oceans, ice, plants, in living organisms, and inside the Earth in the top few miles of the ground.
From evolution to extinction, here are the geological events and history of Earth timeline. Since Earth's creation, oceans, continents and life have emerged. From evolution to extinction, here are the geological events and history of Earth timeline. Skip to content ... Some scientists believe that water originated from the bombardment of comets ...
The history of Earth concerns the development of planet Earth from its formation to the present day. Nearly all branches of natural science have contributed to understanding of the main events of Earth's past, characterized by constant geological change and biological evolution.
Because of the unique properties of water, water molecules can cycle through almost anywhere on Earth. The water molecule found in your glass of water today could have erupted from a volcano early in Earth history. In the intervening billions of years, the molecule probably spent time in a glacier or far below the ground.
Geologic history of Earth, evolution of the continents, oceans, atmosphere, and biosphere. The layers of rock at Earth’s surface contain evidence of the evolutionary processes undergone by these components of the terrestrial environment during the times at which each layer was formed.