What causes

(a) floods

(b) soil erosion

(c) droughts?

(a) An overflow of a huge amount of water on land due to heavy rains or an increase in the water level of rivers causes a flood.

(b) Soil erosion by water is the process where water removes the top layer of soil, especially during rainfall, runoff, or flooding.

(c) Drought is the condition of usually dry weather within a geographical region which does not receive rain for a long duration continuously or receives very low rainfall.