For example, \(y=\frac{4}{x-2}\): Note that as the graph approaches x=2 from the left, the curve drops rapidly towards negative infinity. This is because the numerator is staying at 4, and the denominator is getting close to 0. That means that the fraction itself is getting very big and negative.
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.
1 Most natural disasters are caused by weather. 2  Weather disasters can be caused by hurricanes, tornadoes, floods, tsunamis, thunderstorms, wind storms, wildfires, avalanches, and blizzards.3  Some of the weather disasters can be predicted such as hurricanes and blizzards. Some wildfires are caused by lightning, but some are caused by people. 2  Flooding is the worldâs most expensive type of natural disaster because the damage can be so extensive. 3  Earthquakes are the deadliest of all natural disasters. 4  Some kinds of disasters are more common in some places than in others.