How many times in total has Earth formed a super continent? I know there was a Pangaea at one point in history that broke into the continents of today, but I could have sworn there was another instance in Earth's history that there was a super continent, maybe even more, so how many in total?
According to a review by Nance &amp; Murphy (2013), there are five known supercontinents, from the most recent to the most ancient: 


Pangea (of course)
Pannotia (though it depends on how you define supercontinent), ca. 600 Ma
Rodinia, breakup at ca. 750 Ma (see e. g. Torsvik, 2003)
Columbia (also called Nuna), ca. 1.6 Ga
Kenorland, ca. 2.7 Ga


Some additional ones such as Vaalbara in the Archean are still mostly speculative.