While August 1st marks the beginning of autumn and harvest time in the Gaelic culture, Carl was spending a fortune to snatch the last fan of Sweden to survive the heatwave. Everyone else´s brains also seem to have melted down, so here are just a few photographic impressions snatched from Flickr and NASA in order to have a reason for posting the riddles 😉
Relax and enjoy summer while it lasts!
In this set of Friday riddles Matt asks for volcanoes and geologic features. As always, 2 points for each correct answer, 1 point after a clue is given. Happy Harvest!
1) Image. Answer: Batholith (bath-o-lith 😉 ). A batholith is large granite body in the crust that is derived from repeated igneous intrusions. “Lith” is a prefix or suffix, derived from the Greek word “lithos,” that usually means “made of stone” or “from stone. Sissel, 2 points.
2) This volcanic island has thousands of hot springs, and was created by one of our favorite hotspots. Boogie woogie! Answer: Disko Island on the West Coast of Greenland. It was created by eruptions of the Iceland hotspot as the North American plate rode over it. Sissel, 2 points.
3) This volcanic island is known for its statues and petroglyphs. It’s unusual, though, that you can catch sharks here. Answer: Zapatera Island, in Lake Nicaragua. It is unusual that you can catch sharks, because the lake is freshwater. However, bull sharks live there, as they can swim upriver from the ocean. There are quite a lot of artifacts on this island! Sissel and dinojura44, 1 point each.
4) Three come together, two drift apart. When I open, extinctions start. Answer: Slab window. When a ridge is subducted, the spreading continues, but the rising magma no longer solidifies, creating a gap, or window, along the subduction zone. In this window there is no longer a subducting slab, so the volcanic arc goes extinct in this region. However, this may not be the end of volcanism, as the upwelling from the ridge continues. This results in extension on the overlying plate, and may result in basaltic volcanism in the window. Sissel, 2 points.
5) Cloudy but dry… look for the ancient mathematician. Clue: The mathematician was a failure. Answer: Socorro island. It was once called “Isla Anublada”, or “Cloudy Island” It’s on the Mathematician Ridge, an extinct failed rift in the Pacific. The island itself is mostly dry scrub. Bobbi, 1 points.