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.
Floods are caused by rain, but flooding is more about how much rain falls, how fast it falls, and what happens to the rain after it hits the ground. The most common type of flood that happens during a thunderstorm is a flash flood.Most flash floods are caused be slow moving thunderstorms, thunderstorms that repeatedly move over the same area, or heavy rains from a tropical storm or hurricane.he most common type of flood that happens during a thunderstorm is a flash flood. Most flash floods are caused be slow moving thunderstorms, thunderstorms that repeatedly move over the same area, or heavy rains from a tropical storm or hurricane.