Question

wby are we left with only a tiny fraction of water even if about three-fourths of the earth surface is water

Answer 1

This is so because the earth is mostly covered with saline water which is unfit for use of humans. Also most of fresh water is in the form of glaciers and frozen ice in ice caps. remaining fresh water is in groundwater Reserves. and only a very small percent is present in rivers, lakes and other water bodies.

Answer 2

Three-fourth of the Earth surface is covered with water but that portion water is polluted and not suitable for human beings. Thus, we are left with only a tiny fraction of water on the Earth.