Smooth muscle, such as in the digestive system, is also controlled by the autonomic nervous system. Like heart muscle, it is not under our conscious control. The SNS is responsible for controlling voluntary body movements, such as movement of the arms and legs.
The oceans cover 71 percent of the Earth's surface and contain 97 percent of the Earth's water. Less than 1 percent of the Earth's water is fresh water, and 2-3 percent is contained in glaciers and ice caps. The oceans contain 99 percent of the living space on the planet. If the ocean's total salt content were dried, it would cover the continents to a depth of 5 feet.
Quora. Dec 2016 about 71 percent of the earth's surface is water covered, and oceans hold 96. Water also exists in the air as water vapor, rivers and lakes, icecaps glaciers, ground soil moisture aquifers, even you your dog. Googleusercontent search. Over 68 percent of the fresh water on earth is found in icecaps and glaciers, just over 30 ground. The water in the world (pdf) united states environmental facts worldwide weighing earth's from space feature articles.