Roughly 71 percent of the Earth is covered in water, according to the U.S. Geological Survey. However, 96.5 percent of the water covering the Earth is saltwater and is unsuitable for human consumption. The remaining 3.5 ... More » Science Earth Science

Water erosion occurs when moving water carries away bits of rock and dirt. There are four types of water erosion: sheet erosion, rill erosion, gully erosion and bank erosion. All of these depend on the type of land being... More » Science Earth Science Erosion & Weathering

Hydropower is one of the oldest power sources, and it is a renewable source. Hydropower is less costly than most energy sources, and states in the United States that get the majority of their power from water have lower ... More » Home & Garden Home Maintenance
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The land-to-water ratio on Earth is about 29 percent land to 71 percent water, according to the U.S. Geological Survey. Most of the Earth's water, about 96.5 percent, is saline water contained in the oceans. More » Geography Bodies of Water

Earth supports life because it is the correct distance from the sun, its composition is rock, it has a molten core, it gains protection from its atmosphere and it has water. There are approximately 500 planets in the Mil... More » Science Earth Science

According to the U.S. Geological Survey, water makes up about 71 percent of the Earth's surface. About 96.5 percent of that water is in the oceans. Bodies of water, rivers, icecaps and water vapor hold much of the rest o... More » Science Earth Science

Seventy percent of the Earth's surface is covered by water, while the remaining 30 percent consists of the seven continental landmasses. The Earth is unique among the known planets in that is has an abundance of liquid w... More » Science Earth Science