I need some info about....?

Question

droughts.and when they accur,and some characteristics about droughts.

thanx

Answer 1

I could have tried to explain something but given the wheel has be invented and documented already, here you go: http://en.wikipedia.org/wiki/Drought

Answer 2

A drought is a period of months or years when a region notes a deficiency in its water supply. Generally, this occurs when a region receives below average precipitation over an extended period, usually ranging from several months to several years. However, it can also be worsened by man. It can have a substantial impact on the ecosystem and agriculture of the affected region. Although droughts can be long-lived, even a short, intense drought can cause significant damage [1].

Man-made erosion can play a role, as it did in the North American Dust Bowl in the 1930s, as can general climate change. Many speculate that global warming will have a substantial impact on agriculture [2] throughout the world, and especially in developing nations[3]. For most regions, drought is a normal, recurrent feature of the climate, and having adequate drought mitigation strategies in place can greatly reduce the impact. Regardless of the cause, recurring drought can also bring about desertification. Recurring droughts in the Horn of Africa have created grave ecological catastrophes, prompting massive food shortages, still recurring.