The water cycle — technically known as the hydrological cycle — is the continuous circulation of water within the Earth's hydrosphere, and is driven by solar radiation. This includes the atmosphere, land, surface water and groundwater.
Various phenomena, such as rainfall, snowmelt, monsoons, typhoons, hurricanes, and cyclones can cause rivers to<u> </u><u>flood</u> their banks.
Flooding typically takes place while prolonged rain falls over numerous days, heavy rain falls over a brief length, or whilst an ice or debris jam causes a river or circulates to overflow onto the surrounding place. Flooding can also result from the failure of water manipulate structures, including a levee or dam.
The most essential sources of flood-inflicting precipitation and runoff within America are extratropical cyclones and their associated fronts; convective thunderstorms, especially after they arise in mesoscale convective structures; and tropical cyclones.
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The main reason for the wall's construction had always been defense. Since China's first dynasty, the empire faced a near-constant threat of attack from the nomadic tribes to the north. This included those famed Mongols as well as lesser-known groups like the Xiongnu and the Göktürks.
