A natural phenomenon is an observable fact or event that occurs naturally, without human intervention, in the earth's environment, or in outer space, following the laws of physics or chemistry. Some natural phenomena are harmless, but there are those that could be extremely dangerous for humans and animals as they greatly affect man's environment. Wind, rain, tornadoes, lightning, volcanic eruptions, earthquakes, etc. are natural phenomena.
Phenomenon (singular), phenomena (plural).
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