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Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
A A-grade Also aid climbing grade. The technical difficulty grading system for aid climbing (both for "original" and an adapted version for "new wave"), which goes: A0, A1, A2, A3, A4, A5 and up to A6 (for "new wave"). See C-grade. Abalakov thread Abalakov thread Also V-thread. A type of anchor used in abseiling especially in winter and in ice climbing. ABD Also assisted braking device. A term ...
Firth – Scottish word used for various coastal inlets and straits; Fjard – Glacially formed, broad, shallow inlet; Fjord – Long, narrow inlet with steep sides or cliffs, created by glacial activity; Geo – Inlet, a gully or a narrow and deep cleft in the face of a cliff; Gulf – Large inlet from the ocean into the landmass List of gulfs
An impermeable rock stratum which not only obstructs the passage of water but cannot absorb it, e.g. granite. [4] aquitard A bed or layer of rock that slows the conveyance of water from an aquifer due to its low permeability or low hydraulic conductivity. archipelago. Also island chain. A chain, cluster, or collection of islands in a sea. arête
The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type.
This list of Latin and Greek words commonly used in systematic names is intended to help those unfamiliar with classical languages to understand and remember the scientific names of organisms. The binomial nomenclature used for animals and plants is largely derived from Latin and Greek words, as are some of the names used for higher taxa , such ...
When a rock's running surface travels over a foreign particle such as a hair, causing the rock to deviate from its expected path, usually by increasing friction and thereby the amount of curl Pin Spot at the exact centre of the house, officially called the tee. Playdowns Competitive play towards club, state/provincial, national, and world ...
In rock climbing, beta can include background information about a route's grade of difficulty (e.g. what drove the grade), detailed aspects about the crux (e.g. "you need to use your left hand, not your right"), the climbing style needed (e.g. long reaches or tiny crimps), the best way to protect the route (e.g. "insert a number 4 SCLD before ...