Does a drought have weather geologic or human cause?

If a drought has a geographical cause, it is not called a drought but a desert. Natural deserts tend to occur in the rain shadows of mountains, far from oceans, or under Hadley Cells. With the exception of problems caused by volcanoes, the weather phenomena caused by geographical features usually remains constant.

A drought is frequently caused by weather. An El Nino means the Pacific Ocean is warmer off the coast of Peru and the Indian ocean is cooler off the coast of Africa. More water evaporates and turns to rain when the ocean is warmer. A La Nina means the opposite. Less water evaporates and turns to rain when the ocean is cooler. That creates a drought.

In the Western United States, people have sold "water rights," which gives people downstream the rights to unimpeded stream flow. As a result many beaver dams were destroyed. With that destruction, a lot of land dried up. That caused conditions to become dryer. That created a man made drought. In Asia much of the land in the center of the empire of Timerlane suffered from over grazing. That created a drought.

Thus, a drought can be caused due to either weather or human activity.