The second group of convection currents operated in the upper half of the mantle only, split the ur-continent and carried North and South America away from Eurasia, explaining the similarity in the two coastlines—[…]
Source: wiktionary
Ur-continent
Synonyms for "ur-continent" (1 found)
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Noun(1 words)
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.