Question

Sources of fresh water. Why all water are not in usuable form

Answer 1

because all water is not fresh water some polluted water in some places water is too salty soo we can't drink it like sea water and in some places water is too polluted that is polluted by us only and in some places water is flooded so all water not usable

Answer 2

Sources of fresh water : Ice sheets, ice caps, glaciers, icebergs, bogs, ponds, lakes, rivers, streams, and even underground water called groundwater. This is about 2.5% of  all the fresh water on /in the earth.

Salt water found abundantly in oceans and seas can be desalinated and used as Dubai does. However, it is an expensive process.

68.7 % of this fresh water is frozen, which again can be melted and used but it creates an imbalance in nature because if a part of the mass of an object is taken away it will heat up faster.

30.1 % of the fresh water is underground which are not necessarily underground streams but also just moist/wet mud.

That leaves 0.0003 % of water on earth, 20.58% of that are rivers and lakes which are usable.