ancient earth planet with laurasia and gondwana continents from space

ancient earth planet laurasia gondwana continents space wegener science theory continental drift mass formation euramerica laurussia historical pangaea superocean geological age neoproterozoic precambrian supercontinent continent ocean magma geography earthquake sea tsunami disaster world antique history paleozoic mesozoic era panthalassa view origin geology laurentia baltica kazakhstania siberia north china south tarim panagea