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This article discusses how rocks are formed. There are also articles on physical rock formations, rock layerings , and the formal naming of geologic formations. Terrestrial rocks are formed by three main mechanisms: Sedimentary rocks are formed through the gradual accumulation of sediments: for example, sand on a beach or mud on a river bed. As ...
A rock formation is an isolated, scenic, or spectacular surface rock outcrop. Rock formations are usually the result of weathering and erosion sculpting the existing rock. The term rock formation can also refer to specific sedimentary strata or other rock unit in stratigraphic and petrologic studies.
An area of particular note is the Giant's Causeway on the north coast, a mainly basalt formation caused by volcanic activity between 50 and 60 million years ago. [21] The basalts were originally part of the great Thulean Plateau formed during the Paleogene period. [22]
Mamelon – Rock formation created by eruption of relatively thick or stiff lava through a narrow vent; Mid-ocean ridge – Basaltic underwater mountain system formed by plate tectonic spreading; Pit crater – Depression formed by a sinking or collapse of the surface lying above a void or empty chamber
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column).
A speleothem (/ ˈ s p iː l i ə θ ɛ m /; from Ancient Greek σπήλαιον (spḗlaion) 'cave' and θέμα (théma) 'deposit') is a geological formation made by mineral deposits that accumulate over time in natural caves. [1] Speleothems most commonly form in calcareous caves due to carbonate dissolution reactions. They can take a ...
Natural arch – Arch-shaped natural rock formation; Wave-cut platform – Narrow flat area created by erosion; Longshore drift – Sediment moved by the longshore current Deposition (sediment) – Geological process in which sediments are added to a landform or landmass; Coastal sediment supply – Transport of sediment to the beach environment
Government formation is the process in a parliamentary system of selecting a prime minister and cabinet members. If no party controls a majority of seats, it can also involve deciding which parties will be part of a coalition government .