What is a a natural disaster?

Answer 1

It is a disaster that wasn't caused by mankind. It is a disaster caused naturally, like a major hurricane, a tsunami, an earthquake, a volcano eruption, a flood etc.

Any event or force of nature that has catastrophic consequences, such as an avalanche, earthquake, flood, forest fire, hurricane, lightning, tornado, tsunami, and volcanic eruptions; a destructive event that affects the natural world and human communities.
An earthquake that causes damage to property and loss of life is an example of a natural disaster.
A natural disaster is the effect of a natural hazard (e.g. flood, tornado, volcano eruption, earthquake, or landslide) that affects the environment, and leads to financial, environmental and/or human losses.

According to Wikipedia

Answer 2

A natural disaster is what eart makes like an earthquick, a tornado, a flood E.T.C

Answer 3

Something like an earthquake, a hurricane, a blizzard, etc. something that "mother nature" makes that is not man made