It was composed of continental sial [sy-al], a granitic rock, which was balanced in a layer of denser material, called sima, constituting the uppermost portion of the Earth's mantle.
It was composed of continental sial [sy-al], a granitic rock, which was balanced in a layer of denser material, called sima, constituting the uppermost portion of the Earth's mantle. Proposed by Alfred Wegener, late in the Triassic period it had segmented and formed the Atlantic Ocean. Prior to that, Panthalassa surrounded this precursor to Laurasia and Gondwanaland. FTP, name this prehistoric supercontinent.
It was composed of continental sial [sy-al], a granitic rock, which was balanced in a layer of denser material, called sima, constituting the uppermost portion of the Earth's mantle.
{Pangaea}