Phenomena

thumb|The combustion of a match is an observable occurrence, or event, and therefore a phenomenon.

Vertigo is a condition in which a person has the sensation that they are moving, or that objects around them are moving, when that is not the case. Often it feels like a spinning or swaying movement. It may be associated with nausea, vomiting, perspiration, or difficulties walking. It is typically worse when the head is moved. Vertigo is the most common type of dizziness.

thumb|200px|A four-leaf clover, a rare variant of the [[shamrock, is often considered to bestow good luck.]]

thumb|An illustration of the route of ASMR's tingling sensation

phenomenon involving multiple organisms reacting to each other

psychological phenomenon wherein a subject makes motions unconsciously

thumb|Superbloom in Riverside County, California in 2019 A superbloom is a rare desert botanical phenomenon, mostly in California and Arizona, where an unusual large proportion of wildflowers whose seeds have lain dormant in desert soil germinate and blossom at roughly the same time. The phenomenon is associated with an unusually wet rainy season. The term may have developed as a label in the 1990s.