No it is not. Most water is found in glaciers therefore rendering it impossible to use.
underground
well, the answer to that would be groundwater. Study Island question.☮♥☺§кץєUsable as in potable? If so, the answer is likely that it is frozen in the world's icecaps and glaciers.
Because water is recycled in the water cycle, the water supply is to some extent limitless. However, in many parts of the world "usable" water is limited. Most, if not all of the time this is due to the ground not holding water as well as in area's of the world that "usable" water is plentiful. In other words there is plenty of water on Earth for everyone, but getting enough to everyone in a usable form is a problem that man has not solved.
Because water is recycled in the water cycle, the water supply is to some extent limitless. However, in many parts of the world "usable" water is limited. Most, if not all of the time this is due to the ground not holding water as well as in area's of the world that "usable" water is plentiful. In other words there is plenty of water on Earth for everyone, but getting enough to everyone in a usable form is a problem that man has not solved.
Most of the water is salty and contained in the seas.
North America is the country that has the most usable fresh water. The United States and Canada almost tie for their water resources due to glacier lakes and rivers.
Most of the water on Earth (other than in mineral hydrates) is saltwater, about 97% of it. Oceans are salt water. The other 3% is fresh water, but 67% of that fresh water is in the ice caps. That only leaves about 1% of the total water as usable fresh water. But that is still a vast amount of water, enough to fill aquifers, streams, rivers, and lakes.
Only about 3% of Earth's water is fresh. Two percent of the Earth's water (about 66% of all fresh water) is in solid form, found in ice caps and glaciers. Because it is frozen and so far away, the fresh water in ice caps is not available for use by people or plants. That leaves about 1% of all the Earth's water in a form usable to humans and land animals. This fresh water is found in lakes, rivers, streams, ponds, and in the ground. (A small amount of water is found as vapor in the atmosphere.)
Only about 3% of Earth's water is fresh. Two percent of the Earth's water (about 66% of all fresh water) is in solid form, found in ice caps and glaciers. Because it is frozen and so far away, the fresh water in ice caps is not available for use by people or plants. That leaves about 1% of all the Earth's water in a form usable to humans and land animals. This fresh water is found in lakes, rivers, streams, ponds, and in the ground. (A small amount of water is found as vapor in the atmosphere.)
Most of it is sea water, some of it is ice.
No. It's a never ending cycle. The water that's on Earth is the same water that the dinosaurs drank.However, we can run out of fresh water. Nearly all the Earth's water is in the oceans; when we use water from lakes and rivers we contaminate it so that it can't be used again until it evaporates and re-falls as rain (or we purify it somehow, which takes a lot of energy).
Most of the water on earth is salt water.