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What is a supercontinent?

What is a supercontinent? Here are some definitions.

Noun
  1. A very large continent that split into smaller ones in the Earth’s geologic past.
  2. A modern landmass composed of multiple continents, i.e. Afro-Eurasia or the Americas. (Compare subcontinent).
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Examples
Geological evidence shows that all continents remained united as the supercontinent Pangea during Triassic times.
Amalgamation of the late Palaeozoic supercontinent Pangaea led to the collision of Gondwana with Laurasia forming the Variscan orogen.
If the past pattern holds, Dr Rogers predicts that a new supercontinent will be formed in about 500m years' time.
About 500m years later, its pieces reassembled to form yet another supercontinent, called Rodinia.
Of the three domains, the Eastern Domain sits farthest inboard, i.e. closest to the core of the former Gondwana supercontinent.
At longer time-scales, plate tectonic activity appears quasi-periodic and self-organizes into the supercontinent cycle.

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