An event that's caused by the natural forces of the Earth and results in great damage and possibly loss of life.
10 of the Deadliest Natural Disasters in 2018, according to data from the Centre for Research on the Epidemiology of Disasters, based in Belgium :
How tsunamis work
Why there's a ring of natural disasters around the Pacific
10 Most DANGEROUS Natural Disasters!
Earthquakes 101 | National Geographic