A natural phenomenon is an event or occurrence that happens in nature without human intervention. Examples include earthquakes, volcanoes, and tornadoes. These events are often caused by natural processes, such as the movement of tectonic plates or changes in weather patterns. Other natural phenomena include auroras, which are beautiful light displays in the sky caused by solar winds interacting with the Earth's atmosphere. Additionally, bioluminescence is a phenomenon where living organisms, like certain types of jellyfish and fireflies, produce light through chemical reactions.