Science
Related: About this forumScientists solve mystery of how Giant's Causeway was formed
Volcanologists use samples from Eyjafjallajökull in Iceland to recreate famous hexagonal columns in laboratory
Hannah Devlin Science correspondent
@hannahdev
Thu 12 Apr 2018 11.02 EDT
According to legend, the Giants Causeway was built by the Irish giant, Finn MacCool, as a crossing to confront his Scottish rival. Scientists have an alternative explanation, and for the first time they have reproduced in the laboratory the process through which the causeways 40,000 near-perfect hexagonal columns were formed.
Geometric columns are seen in a variety of volcanic rocks across the Earth and are known to form as the rock cools and contracts, resulting in a regular array of polygonal prisms or columns. But until now, geologists had been unsure of the threshold at which cooling magma suddenly fractures into a geometric pavement.
Yan Lavallée, professor of volcanology at the University of Liverpool and lead author, said: [This] is a question that has fascinated the world of geology for a very long time. We have been wanting to know whether the temperature of the lava that causes the fractures was hot, warm or cold.
To answer the question, Lavallée and colleagues recreated the process in the laboratory using basalt cores drilled from the Eyjafjallajökull volcano in Iceland. The 20cm-long cylinders, gripped by a clamp at each end, were heated to more than 1,000C until they began to soften into lava. The samples were fixed at each end in a mechanical grip and cooled to test at what point they snapped.
More:
https://www.theguardian.com/science/2018/apr/12/scientists-solve-mystery-of-how-giants-causeway-was-formed?utm_source=esp&utm_medium=Email&utm_campaign=Lab+notes+2016&utm_term=271305&subid=25418764&CMP=ema-3242
More images of the Giant's Causeway:
https://images.search.yahoo.com/search/images;_ylt=AwrUieGn6_harkMAmmeLuLkF;_ylc=X1MDOTYwNTc0ODMEX3IDMgRiY2sDZWFlcjdmOWNnbDI5ZyUyNmIlM0Q0JTI2ZCUzRGZFVE9PSzFyWUgzS3VfNWJGaWk4THF3a19jX3JYc19ya1E2azM1dGQ0N2NwM1EtLSUyNnMlM0RkayUyNmklM0RhUld1NUEwY3cxX0t4T1NsM1EyTQRmcgMEZ3ByaWQDU2hnVUpEMUJRbFdiZnh1WFJnVC5RQQRtdGVzdGlkA251bGwEbl9zdWdnAzEwBG9yaWdpbgNpbWFnZXMuc2VhcmNoLnlhaG9vLmNvbQRwb3MDMARwcXN0cgMEcHFzdHJsAwRxc3RybAMxNwRxdWVyeQMgR2lhbnZcyBDYXVzZXdheQR0X3N0bXADMTUyNjI2MjcwOAR2dGVzdGlkA251bGw-?gprid=ShgUJD1BQlWbfxuXRgT.QA&pvid=NuHBjjEwLjLlO2d6WQqJMAJtMjYwMAAAAAC5xiXO&fr2=sb-top-images.search.yahoo.com&p=+Giants+Causeway&ei=UTF-8&iscqry=&fr=sfp#id=143&iurl=http%3A%2F%2F2.bp.blogspot.com%2F-WxKqw2k57rA%2FVzn1DijMA8I%2FAAAAAAAAAK8%2FSW9jTswncZI5hH6MT475RWTpgAMvWuOTgCK4B%2Fs1600%2Fgiants-causeway-f.jpg&action=close
marble falls
(56,043 posts)robbob
(3,512 posts)Definitely a full days outing though. There are beautiful hiking trails up and down the coastline that looked like quite the workout. One of our travelling companions was wheelchair bound, unfortunately, so we basically rode the bus down, hung out for an hour while some of us walked the stairway down to the ocean, and then left. So it was a bit pricy for the time spent, but how can you put a price on a memory that will last a lifetime?
marble falls
(56,043 posts)RainCaster
(10,585 posts)Along the Columbia River, near Vantage.
DBoon
(22,256 posts)eppur_se_muova
(36,222 posts)Devil's Tower was apparently an ancient magma intrusion, not an actual volcano as once believed.
https://media.gettyimages.com/videos/shot-of-birds-eye-view-fly-over-devils-tower-wyoming-united-states-video-id503236181
Javaman
(62,397 posts)genxlib
(5,501 posts)In Nova Scotia on some islands along the Bay of Fundy.
Combined with the crazy tides, that was a pretty cool place to visit.
Locrian
(4,522 posts)Brother Buzz
(36,127 posts)A flatbed truck loaded with columnar basalt was parked in my town over the weekend. I had to stop and marvel at the load of neatly loaded pallets of 8, 10 and 12 foot lichen encrusted columns. Undoubtedly, they were destined for an upscale landscaping project down the road. Interesting, the were ALL five sided columns.
Nitram
(22,614 posts)basalt and is believed to be the birthplace of the gods.
Judi Lynn
(160,083 posts)For anyone else who is curious, please see these images:
https://images.search.yahoo.com/search/images;_ylt=AwrJ7JpedPtaDoMAwStXNyoA;_ylu=X3oDMTB0N2Noc21lBGNvbG8DYmYxBHBvcwMxBHZ0aWQDBHNlYwNwaXZz?p=Takachiho&fr2=piv-web&fr=sfp
I wouldn't need to live another day after seeing any place like this. It's simply too much heaven for any spot on earth.
Thank you, Nitram.
It's in Kyushu, Japan's southernmost island. Nagasaki, bombed to hell is also located on Kyushu.
Nitram
(22,614 posts)My wife and I rowed through the gorge on a trip around Kyushu. It is a breathtakingly beautiful place.