In mid-20th century, many believed the ocean floor was made of great plains, not valleys and mountains. Aeon Video: http://ow.ly/FUJf306HfVD pic.twitter.com/YHbctLJD8q
9:00 PM - 1 Dec 2016
0 replies
3 retweets
13 likes
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.