geology - rocks! https://t.co/Zf22nD9NIb— Robin Curtis #MVM (@planetkooler) August 12, 2018 (via…
#geology - rocks! https://t.co/Zf22nD9NIb
— Robin Curtis #MVM (@planetkooler) August 12, 2018
(via http://twitter.com/planetkooler/status/1028613284499542016)