There are the Summer Olympics and the Winter Olympics. Each are held every four years at alternating intervals meaning one of the games are hosted every two years.
The Olympics are every 4 years, but since we have the season of summer & winter Olympics it is more like every 2 years for the Olympics.
the ancient Olympic Games
every four years in olympus
Every 4 years.
there will be 5 books in the heroes of Olympus
every 4 years
Leap years occur every 4 years.
Olympus Mons has likely had many large eruptions over the years. It is the largest observed mountain in the solar system, rising over 80,000 feet from the surface of Mars.
About every 2 years.
Every four years.
each census is taken every 10 years
1000 years old
every 2 years