Natural phenomenon
observable event which is not human-made
hydraulic jump
Dragon Storm
sky phenomenon
Nipa
tumbleweed
spring flood
Intersex
earthquake precursor
mating ball
weather
meteor
foehn wind
coronal hole
ice disc
frost heaving
orographic lift
Melt inclusions
flooding of the Nile
coastal erosion
groundwater recharge
Pockmark
meteorological phenomenon
twilight
whiting event
valence
red rain in Kerala
bolting
stream capture
hair ice
Saturn's hexagon
pyroclastic fall
dead water
upwelling
tidal resonance
precipitation
Chiral magnetic effect
quake
dawn chorus
surge
American Permian Basin
cheerios effect
life
low water
flood
golden hour
algal bloom
medusa bloom
rock magnetism
ice shove
hail