Table Topography: Wood Furniture Embedded with Glass Rivers and Lakes by Greg Klassen
Banded Iron Formations (by Ale*)
The Banded Iron Formations (BIFs) are a series of stratigraphic rock units deposited at different times in different environments. They contain higher-than-usual amounts of iron (Fe). These deposits are all Precambrian in age, and the ones in the image in particular are Archean (older than 2.5 billion years ago, that is 2,500,000,000 years). The current explanation for the abundance of Fe in these layers, albeit not totally accepted by the scientific community, is that Fe existed in solution in Archean ocean waters in its reduced form. Sudden increase in the amount of available oxygen, caused by the beginning of photosynthetic life in the form of stromatolite-building cyanobacteria, would have caused the reduced Fe to oxidize to hematite (and possibly magnetite). There is evidence in the fossil and rock records of an increase in atmospheric oxygen right after the last deposited BIFs. BIFs were never to form again. At the very beginning, before any BIFs were ever deposited, the most common form of Fe on Earth’s surface was pyrite. Pyrite today would not stand a chance of preservation in subaerial environment because of the abundance of oxygen in the atmosphere.
Fuente: Flickr / greenriver
YURI PATTISON, chelyabinsk eBay extrusions <three>, 2013
.925 silver, 316L stainless steel, titanium, .STL files
When the Chelyabinsk meteor entered Russia in 2013, Yuri Pattison watched as meteorite fragments were instantly commodified on eBay. Fascinated by the market, the perceived spirituality or superstitious quality of the fragments, looming questions of authenticity, and how meticulously the fragments were photographed, Pattison saved hundreds of images onto his computer. He started to think about how he could materialize and heighten the question of supply and demand, seeing as how reports on the size of the meteorite varied greatly and the actual supply of fragments was unknown.
"The interesting thing about working digitally, especially with 3D printing," he wrote, "is that the information that’s contained and conveyed through the work is of primary importance. The value isn’t necessarily based on whether the piece is a copy or an original." Ultimately, Pattison reverse engineered the images back into physical form as 3D printed objects in silver, stainless steel, and titanium, returning the meteorite fragments, layered with new meaning, to the realm from which they emerged. (Text by Paddles ON! curator Lindsay Howard)
South America’s second largest river, the Paraná River (and its tributaries) is seen here in this astronaut photo acquired on April 9, 2011, revealing an 18-mile-across (29 kilometers) expanse of the river downstream from Goya, Argentina. - NASA Earth Observatory [x]
The Magnificent Neptunian System
Astrophotographer Rolf Wahl Olsen made this composite image from data acquired during NASA’s Voyager 2 closest approach to Neptune on August 25, 1989. The dim outer planet, largest moon Triton, and faint system of rings can all be seen. From just beyond Neptune’s orbit, the interplanetary perspective looks back toward the Sun, capturing the planet and Triton as thin sunlit crescents.
Erosion Spider, by John Clemens.
Toward the bottom of the Grand Canyon in Arizona, USA, lies the Middle Cambrian Bright Angel Shale, a variably coloured sequence of relatively soft sedimentary rocks, here sculpted by erosion into a spider-like outcrop decorated with small green desert shrubs.
Taken on 8 April 2013. Winner in the EGU Photo Contest 2014.
A starburst or red tourmaline stands out against its white surroundings. Tourmaline is the name for a group of related minerals; red tourmaline also can be called rubellite. Semiprecious gemstones, tourmalines belong to a family of borosilicate minerals. They come in a range of colors from red to black and are found from Madagascar to Maine. (via National Geographic)
Fuente: National Geographic