Droughts are caused by changes in land and sea surface temperatures, atmospheric circulation patterns and soil moisture content. A change in any one of these factors sets up a cyclical chain of events that can result in ... More »

According to About.com, there are many causes for drought, but the most important one "relates to the amount of water vapor in the atmosphere, as this is what creates precipitation." Moist, low pressure systems tend to b... More »

www.reference.com Science Weather & Tides Rain

Put simply, droughts are caused by a prolonged depletion of precipitation in a certain ecosystem or climate over a long period of time. Unlike normal dry spells, droughts are so severe that they can thoroughly dry out va... More »

Predicting floods requires a complicated analysis of not only rainfall potentials, but also the hydrologic condition of the watershed area, current river and stream levels and soil moisture levels. These predictions can ... More »

During a drought, the affected area has less water, which can cause plants to struggle and die. Droughts can also cause erosion and threaten animal populations. More »

According to About.com, there are many causes for drought, but the most important one "relates to the amount of water vapor in the atmosphere, as this is what creates precipitation." Moist, low pressure systems tend to b... More »

www.reference.com Science Weather & Tides Rain

Areas of high elevation, such as mountain ranges, often drain the air of its moisture. As the air rises up the mountain, it cools. As the air cools, it loses its ability to hold water. The water then condenses out of the... More »