Earth is the "watery planet". With over 70% of the earth's surface covered with water,It makes water the most common substance on earth. Oceans contain 97% of the earth's water while the remaining 3% is classified as fresh water. Seventy-seven percent of this surface fresh water is stored as ice, and 22% as ground water and soil mosture. The remaining fresh water, making up less than 1% of the world total, is contained in lakes,rivers and wetland. |
