Natural disaster

A natural disaster is an event or series of events that has an adverse effect on the environment, usually causing excessive levels of damage and/or loss of life. Such events are caused by unforseen or uncontrollable environmental conditions, or from external sources such as atmospheric conditions or even mishaps from outer space. Examples of natural disasters include floods, earthquakes, cyclones, tsunamis, volcanos and the occasional meteor shower. Some natural disasters such as the meteor that wiped out all of the dinosaurs or an asteroid hurtling its way towards Earth with only Bruce Willis and a handful of deep core oil drillers to protect us is referred to as an extinction level event.