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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
Recent palaeomagnetic and geodynamic constraints envisage an early Mesoproterozoic supercontinent that at least included Laurentia and Baltica.
When New Zealand split away from the supercontinent Gondwana some 80 million years ago, its flora and fauna were left to develop in isolation.
Geological evidence shows that all continents remained united as the supercontinent Pangea during Triassic times.
Of the three domains, the Eastern Domain sits farthest inboard, i.e. closest to the core of the former Gondwana supercontinent.
Amalgamation of the late Palaeozoic supercontinent Pangaea led to the collision of Gondwana with Laurasia forming the Variscan orogen.
At longer time-scales, plate tectonic activity appears quasi-periodic and self-organizes into the supercontinent cycle.

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