This document discusses four natural phenomena: tornadoes, ocean waves caused by underwater seismic events, earthquakes from accumulated stress in the earth's crust, and droughts from long periods without rainfall. Tornadoes are violently whirling columns of air between the earth and clouds. Ocean waves are caused by underwater earthquakes, volcanoes, or landslides. Earthquakes release accumulated stress in the earth's crust, which are measured on the Richter scale. Droughts occur after long periods without rain that cause dryness and water shortages.