Explain how over cultivated land can increase the risk of flooding​

Factors such as compaction prevent the soil from being able to hold more water and lines and cracks in the soil concentrate the water flow — therefore speeding up the flow of water on the soil's surface. This in turn increases the volume and speed of water flowing into waterways and heightens the risk of flooding.

answer; i believe that the correct answer is (the explosion of a nearby star(supernova);

because there are alot of mountains