Leap years occur every four years.
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there are two tides a low tode and a low each happen once a day
About 300 or so measurable earthquakes occur around the world each day. So far, it is not possible to predict the time when an earthquake will occur. The best scientists can do is predict the frequency (once in how many years) an earthquake of a specific intensity will occur on a given fault line.
There have been many natural disasters to occur over the last 20 years. Some of the natural disasters were earthquakes, tornados, hurricanes, and tsunamis.
Astronomers have known for many years that sunspots are "storms" on the sun's surface, and also that solar prominences seen flaring from the sun during an eclipse probably come from sunspots. what they do not know - yet - is why the sunspots occur in farily regular cycles of many, gradually diminishing to few, and then rising again to many. Times of high sunspot activity are usually also times of high Northern Lights activity and radio interference on earth.