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Joint (geology) Horizontal joints in the sedimentary rocks of the foreground and a more varied set of joints in the granitic rocks in the background. Image from the Kazakh Uplands in Balkhash District, Kazakhstan. Orthogonal joint sets on a bedding plane in flagstones, Caithness, Scotland. Joints in the Almo Pluton, City of Rocks National ...
Columnar jointing. Columnar jointing is a geological structure where sets of intersecting closely spaced fractures, referred to as joints, result in the formation of a regular array of polygonal prisms (basalt prisms), or columns. Columnar jointing occurs in many types of igneous rocks and forms as the rock cools and contracts.
2b2t. 2b2t (2builders2tools) is a Minecraft server founded in December 2010. 2b2t has essentially no rules and players are not permanently banned, known within Minecraft as an " anarchy server". [2] As a result, players commonly engage in the destruction of other players' and groups creations, colloquially called "griefing", as well as hacking ...
30,000 ha (120 sq mi) The Vredefort impact structure is the largest verified impact structure on Earth. [1] The crater, which has since been eroded away, has been estimated at 170–300 kilometres (110–190 mi) across when it was formed. [2][3] The remaining structure, comprising the deformed underlying bedrock, is located in present-day Free ...
Impact structure. An impact structure is a generally circular or craterlike geologic structure of deformed bedrock or sediment produced by impact on a planetary surface, whatever the stage of erosion of the structure. In contrast, an impact crater is the surface expression of an impact structure. In many cases, on Earth, the impact crater has ...
The Great Wall of China, at 6,352 km or 3,947 mi long, is a megastructure. This picture was taken near Beijing in February 2005. A megastructure is a very large artificial object, although the limits of precisely how large vary considerably. Some apply the term to any especially large or tall building. [1][2] Some sources define a megastructure ...
Soil horizon. A cross section of a soil, revealing horizons. A soil horizon is a layer parallel to the soil surface whose physical, chemical and biological characteristics differ from the layers above and beneath. Horizons are defined in many cases by obvious physical features, mainly colour and texture.
Fracture (geology) A fractured rock in the Eastern Cape in South Africa, a mechanism of brittle deformation in response to stress. A fracture is any separation in a geologic formation, such as a joint or a fault that divides the rock into two or more pieces. A fracture will sometimes form a deep fissure or crevice in the rock.