How does habitat destruction happen?
Deforestation is the major cause, but cataclysmic events such as tornadoes and tsunamis can wreck habitat also.
Describe how the destruction of a habitat by a natural disaster might affect the diversity of a population?
Sadly, natural disasters are one specific form of habitat destruction that we cannot control. Earthquakes are going to happen. Flooding is going to happen. These things will happen and there isn't a whole lot we can do about it. If an earthquake happens, it literally moves the ground and disrupts the environment. If a flood or even a tsunami occurs, it will basically kill any species or vegetation that it comes into contact with.