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Causes. There are two main factors that are responsible for causing hurricane storms, viz. warm water and moist, warm air. This is the reason why they begin in tropical regions. They occur when the moist, warm air from the surface of the ocean rises and meets the cooler air.
Causes of flooding. A flood occurs when a river bursts its banks and the water spills onto the floodplain. Flooding tends to be caused by heavy rain: the faster the rainwater reaches the river channel [river channel: The part of the river that holds the water. ] , the more likely it is to flood.