Periodicity records how regularly, or irregularly, a natural phenomenon actually recurs. Wikipedia notes auroras result from "disturbances in the Earth's magnetosphere caused by enhanced speeds of solar wind from coronal holes and coronal mass ejections," events tied to the Sun's own activity cycle rather than a fixed calendar. This dimension separates phenomena that recur on a predictable schedule from those that strike unpredictably.
Rare, because moonlight is far dimmer than sunlight
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National Oceanic and Atmospheric Administration
National Oceanic and Atmospheric Administration- Contains: Aurora
- Contains: Monsoon
- Contains: Tides
- Contains: Ocean Currents
View the Source Encyclopaedia Britannica
What Is Ecological Succession? (University of Chicago News)
Trophic Cascade (Wikipedia)
Camouflage (Wikipedia)
Estivation (Wikipedia)
Coral Bleaching (NOAA Ocean Service)
National Oceanic and Atmospheric AdministrationContains: Coral BleachingView the Source Convergent Evolution (Wikipedia)
Defining Desertification (NASA Earth Observatory)
Phosphorus Cycle (Wikipedia)
Ocean Acidification (NOAA Ocean Service)
National Oceanic and Atmospheric AdministrationContains: Ocean AcidificationView the Source Reader Challenges (0)
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