Hellow guys, Welcome to my website, and you are watching 20억년과의 대화 '그랜드 캐니언'. and this vIdeo is uploaded by EBS 컬렉션 - 사이언스 at 2018-10-02T04:00:04-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.
