I got this off wikipedia:
A natural phenomenon is a non-artificial event in the physical sense, and therefore not produced by humans, although it may affect humans (e.g. bacteria, aging, natural disasters). Common examples of natural phenomena include volcanic eruptions, weather, and decay.
Aurora is one of a natural phenomenonMost natural phenomenons are harmless such as rain. Some natural phenomenons such as volcanic eruptions, tsunami and tornadoes are considered dangerous and might lead to death.
It is basically a phenomena that is not artificial.
a phenomena is any observable occurrence. In popular usage, a phenomenon often refers to an extraordinary event. In physics, a phenomenon may be a feature of matter, energy, or spacetime. For example, Isaac Newton made observations of the phenomenon of the moon's orbit. Additionally, Galileo Galilei made observations of pendulum related phenomena.
The combustion of a match is a phenomena.