Question

how much of earth's water is freshwater

Answer 1

About 2.5% of Earth's water is freshwater. However, a significant portion of this freshwater is not readily accessible for human use: approximately 68.7% is locked up in ice caps and glaciers, and around 30.1% is located underground as groundwater. Only about 1.2% of the total freshwater is found in surface water sources like rivers and lakes. This means that accessible freshwater constitutes a very small fraction of the total water on Earth.