While both nature and mankind have destructive potential, natural disasters generally have greater potential due to their massive scale and forces. Earthquakes release seismic energy that can level cities, tornadoes form powerful rotating columns of wind, hurricanes develop as intense tropical storms, tsunamis are massive waves caused by geological disturbances, and droughts or nuclear bombs unleashed by mankind represent localized but still significant threats. Overall, the document suggests that nature's destructive forces such as earthquakes, tornadoes, and hurricanes have greater potential due to their immense scale and power compared to threats from mankind.