Question

If the Earth is 70% water, why do we have droughts?

Answer 1

Distribution. Water evaporates from oceans, lakes, ponds, rivers, sewers, etc., and mixes in the atmosphere where it is moved as the winds blow, and then if conditions are right, it falls out of the air as rain or snow. Since the winds carrying the water vapor are created by differential heating of the land and oceans, spots where there is little atmospheric water (humidity) and spots where there is much is created. Some of these effects are self-reinforcing. Areas that are hot cause a great deal of local heating which causes high-pressure areas which cause air to move away, which cannot bring water vapor back.

Answer 2

Unequal distribution of water resources on earth.

Step-by-step explanation:

• As the earth has 70% of the water that is stored in the ocean, sea, river and the glaciers as freshwater and even water present underground all which part of the hydrological cycle is insufficient and inefficient to meet the daily requirement of the people on earth.

• Due to this the rest 29% of the land that experiences drought conditions either due to the lack of rains or due to the increasing heat waves from the sun and maybe resulting from overgrazing and overpopulation.