Leap years occur every four years.
200100
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.
Every 4 years.
There are 366 days
From 1896-1992 there were 24 leap years.
There have been six leap years in the last 25.
Olympics occur how many years
55
There can be either 242 or 243 leap years in any 1000-year period.
1976 1980 1984 1988 1992 1996 2000 2004 2008 2012
As least 11 but no more than 13 leap years occur in 50 years.
the years are 6
four
Nine times.