Only about .3% of Earth's volume of water is easily available for human use.
Earth is known as the blue planet since 71 percent of the Earth's surface is covered with water. Water also exists as water vapor in the air and below land surface. Earth is a closed system, which means very little matter, including water, ever enters or leaves the atmosphere. The water that was here billions of years ago is still here right now. However, Earth cleans and replenishes the water supply through the hydrologic cycle.
Even though Earth has an abundance of water, unfortunately only about 0.3 percent, which a very small percentage, of Earth's water is even usable by humans. The other 99.7% of Earth's water is in the soils, icecaps, oceans and floating in the atmosphere.
Learn more about Earth's water here: https://brainly.com/question/27985787
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