A phenomenon that occurs in nature rather than by human action (e.g., weather, earthquakes, seasonal changes).
台風や地震は代表的な自然現象だ。
Typhoons and earthquakes are typical natural phenomena.
オーロラは夜空に現れる美しい自然現象だ。
The aurora is a beautiful natural phenomenon that appears in the night sky.
自然現象を観察して気象の仕組みを学ぶことができる。
You can learn about the mechanisms of weather by observing natural phenomena.