n
Alluvial soil; specifically, in Australia, gold-bearing alluvial soil.
n
(anatomy) A structure conveying fluid, such as the cerebral aqueduct or vestibular aqueduct.
n
(geology) A fine-grained sedimentary rock, intermediate between shale and slate, sometimes used as a building material
n
(geology) A very thin ridge of rock.
n
The layer of hardrock that lies beneath any surface soil, clay, silt, gravel, and/or sedimentary rock.
n
(geology) A roughly cone shaped rock formation, usually consisting of siltstone, peat or loam.
n
(uncountable, geology, mining, engineering, construction) The solid rock that exists at some depth below the ground surface. Bedrock is rock "in place", as opposed to material that has been transported from another location by weathering and erosion.
n
The process of bituminizing.
adj
Of or pertaining to bitumen.
n
The state of being bituminous.
n
(geology) The relatively flat part of a limestone pavement between the grikes
n
(mineralogy) An earth of a deep brown colour, containing more vegetable than mineral matter; an earthy variety of lignite, or brown coal.
n
(petrology) A rounded mass of a mineral, sometimes found in sedimentary rock or on the ocean floor.
n
(geology) A rock consisting of gravel or pebbles embedded in a matrix.
n
(geology, countable) The rock which is native to a certain area.
n
(now historical) Crystal; a piece of crystal.
n
(geology) A desert surface that is covered with closely packed rock fragments; reg, serir.
n
(geology) A layer of clayey earth forming a stratum in a geological formation.
n
(geology) An erosion process that deepens a channel by removing material from a stream's bed or a valley's floor.
n
(chemistry) a synthetic form of graphite made by the electrical heating of some other form of carbon
n
The act of coating with an amalgam of tin foil and quicksilver, as in making looking-glasses.
n
A grid of geosynthetic material used to reinforce soil and other materials.
n
The appearance of rock after having been worn smooth by a passing glacier.
n
A small glacier, or small mass of ice somewhat resembling a glacier.
n
(materials) A region within a material having a single crystal structure or direction.
n
(geology, photography) The size of a grain (particle) in a sediment or emulsion
n
Alternative form of grain size [(geology, photography) The size of a grain (particle) in a sediment or emulsion]
n
An allotrope of carbon, consisting of planes of carbon atoms arranged in hexagonal arrays with the planes stacked loosely, that is used as a dry lubricant, in "lead" pencils, and as a moderator in some nuclear reactors.
n
warming caused by the greenhouse effect
n
(UK, mining) A decomposed granite, forming a mass of gravel, as in tin lodes in Cornwall.
n
(geology) An accumulation of angular, coarse-grained fragments (particles of sand and gravel) resulting from the chemical and mechanical weathering of crystalline rocks.
n
A distinct layer of soil that is largely impervious to water.
n
(geology) Solid, nonporous rock.
n
Alternative form of host rock [(geology) The background mineral material in which the object of study (crystals, fossils, specific minerals, groundwater, etc.) is embedded or through which it travels.]
n
Alternative form of host rock [(geology) The background mineral material in which the object of study (crystals, fossils, specific minerals, groundwater, etc.) is embedded or through which it travels.]
n
(geology) An ore deposit, with indefinite boundaries, consisting of rock impregnated with ore.
n
(geology) Any of various fine-grained siliciclastic sedimentary rocks.
n
(petrology) A fine-grained sedimentary rock whose original constituents were clays or muds.
n
(geology) An elongated body of ore that follows a vein.
n
Transparent and colourless rock crystal.
n
Alternative form of peneplain [(geomorphology) A low-relief plain representing the final stage of fluvial erosion during times of extended tectonic stability.]
n
A shallow glass dish, with a loose-fitting cover, used to culture bacteria.
adj
Resembling rock or stone in its hardness.
v
Of a glacier: to transport individual pieces of bedrock by means of gradual erosion through freezing and thawing.
n
A kind of soil developed over non-calcareous material, usually rock.
n
(UK, regional) One of various types of rock or geological strata.
n
(geology) Any natural material with a distinctive composition of minerals.
n
Fine-grained, silt-sized particles of rock generated by mechanical grinding of bedrock by glacial erosion or artificially.
n
(idiomatic) A person who collects rocks and minerals from the natural environment as a hobby.
n
A dark coating on rock surfaces exposed to the atmosphere, mostly comprising clay and oxides, which grows at only a few micrometers per thousand years; found especially in arid deserts.
n
(geology) The surface of the bedrock beneath soil cover.
n
(informal, US) An introductory course in geology that is attended by student athletes who for legal reasons must attend classes in order to continue playing their sport competitively.
adj
Occurring, or executed on rocks, or on cave walls
n
(geology) An eruption of water through a bed of sand due, for instance, to seismic activity, or to differences in water pressure on two sides of a levee which causes water to penetrate beneath the levee.
n
A collection of small particles, particularly dirt, that precipitates from a river or other body of water.
n
(geology) Clay-like material found along and around a geological fault.
n
(geology) A fine-grained sedimentary rock of a thin, laminated, and often friable, structure.
n
(geology) An extensive bed of an eruptive rock intruded between, or overlying, other strata.
n
An indurated duricrust formed when silica is dissolved and resolidifies as a cement.
n
A rock or a rock formation made smooth by weathering.
n
(geology) A small dislocation in beds of rock along a line of fissure.
n
(mineralogy) The surface, usually made from unglazed porcelain, across which a mineral is dragged to determine its streak.
n
a hole or depression left on the surface of an area which has had an underground (usually nuclear) explosion.
adj
(geology) tending to split into thin flat pieces, such as slate
n
by extension, any melt glasses left by atomic bombs
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