Over 97% of Earth's water is salt water found in oceans, while only 3% is fresh water. Of this fresh water, nearly 70% is frozen in ice caps and glaciers. Another large portion is underground in aquifers. Only 1% of the world's total fresh water, or about 0.3% of Earth's total water, is accessible for direct human use from sources like lakes, rivers, and shallow underground reservoirs. The document provides information about the distribution of fresh water and salt water on Earth.