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Natural phenomenon
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A natural phenomenon is an observable event which is not man-made. Examples include: sunrise, weather, fog, thunder, tornadoes; biological processes, decomposition, germination; physical processes, wave propagation, erosion; tidal flow, and natural disasters such as electromagnetic pulses, volcanic eruptions, and earthquakes. Exposure to forces of nature resulted in about 214,000 deaths in 2010, up from 31,000 in 1990. Types Types of natural phenomena include, but are not limited to, the following. Biological * Decomposition - by which organic substances are broken down into a much simpler form of matter * Metabolism ** Catabolism ** Anabolism ** Fermentation - converts sugar to acids, gases and/or alcohol. * Growth * Population growth ** Overpopulation growth beyond carrying capacity Chemical * Crystal growth * Oxidation ** Fire ** Rusting Geological Geological processes include erosion, sedimentation, and volcanic activities such as geysers and earthquakes. Meteorological Violent Meteorological phenomena are called storms. Regular, cyclical phenomena include seasons and atmospheric circulation. Climate change is often semi-regular. Atmospheric optical phenomena * Aurora * Crepuscular rays * Green flash * Haze * Ice blink * Light pillar * Moonbow * Moon dog * Rainbow * Subsun * Sun dog * Sunbow * Water sky Nuclear and Electrical * Elementary particle interactions * Supernova Oceanographic * Oceanographic phenomena include tsunamis, ocean currents and breaking waves. 
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