PBS8 年
Wegener proposes idea of continental drift
Though trained as an astronomer, he was a specialist on Greenland. He noticed that ... once all attached in a single landmass he called Pangaea (Greek for "all earth"). They were surrounded ...
PBS1 年
Wegener proposes idea of continental drift
Though trained as an astronomer, he was a specialist on Greenland. He noticed that ... once all attached in a single landmass he called Pangaea (Greek for "all earth"). They were surrounded ...