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About 150 million years ago, a massive tectonic mega-plate stretched across the Earth, spanning roughly a quarter of the size of the Pacific Ocean. Its jagged contours ran all the way through the ...

Ancient plate tectonics in the Archean period differs from modern plate tectonics in the Phanerozoic period because of the higher mantle temperatures inside the early Earth, the thicker basaltic crust ...

The number varies from a dozen to almost 100 — and most of these don't even appear on official maps. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...