지구에 존재했던 초대륙들지구상 존재했던 초대륙(supercontinents) 과거순 발바라(Vaalbara)https://en.wikipedia.org/wiki/Vaalbara 우르(ur)https://www.quora.com/What-did-the-continents-look-like-before-Pangea 케놀랜드(kenorland)https://en.wikipedia.org/wiki/Kenorlandhttps://www.quora.com/What-did-the-continents-look-like-before-Pangea 콜롬비아(columbia)https://en.wikipedia.org/wiki/Columbia_(supercontinent)https://www.quora.com/What-did..
