crust

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crust

1. Geology the solid outer shell of the earth, with an average thickness of 30--35 km in continental regions and 5 km beneath the oceans, forming the upper part of the lithosphere and lying immediately above the mantle, from which it is separated by the Mohorovicić discontinuity
2. the dry covering of a skin sore or lesion; scab
3. Oenology a layer of acid potassium tartrate deposited by some wine, esp port, on the inside of the bottle
4. Biology the hard outer layer of such organisms as lichens and crustaceans

crust

The outermost solid layer of a terrestrial planet or a satellite, consisting of rock, ice, or a mixture of the two. See also Earth.

Crust

 

in plants, a complex of tissues on the surface of the stem and roots of woody plants, consisting of dead peridermal cells and parts of the bark. The crust forms as layers of periderm repeatedly form in the phloem. In the case of more or less concentric arrangement of peridermal layers, a ringed crust forms (as in mock orange and grapes); if the peridermal layers overlap, a scaly crust forms (as in oak). Depending on the nature of the depositing of crust, it falls from the surface of the tree in layers, ribbons, or scales. Crust usually forms late (in birch, pine, and oak when the tree is 25–35 years old); it protects the plant from excessive evaporation, sharp fluctuations of temperature, and other undesirable effects.

crust

[krəst]
(geology)
The outermost solid layer of the earth, mostly consisting of crystalline rock and extending no more than a few miles from the surface to the Mohorovičić discontinuity. Also known as earth crust.
(hydrology)
A hard layer of snow lying on top of a soft layer.
References in periodicals archive ?
However, the overlying positive EGM-96 free-air anomaly suggests that the crustal model may not be completely compensated.
1975, "On the dispersion equations for Love waves due to irregularity in the thickness of non homogeneous crustal layer," Acta Geophysica Polonica, 23 307
Although difficult to apply in real-time studies of meso-scale melt generation processes, melting experiments with crustal rocks have been performed to investigate melt behaviour at the microscale (e.
Crustal earthquakes generally follow known fault lines near the surface and cause widespread shaking because they are so shallow and their intensity is distributed largely along the ground.
Granite magma injection complexes, which are common in hot crustal terranes, are thought to result from magma migrating pervasively through an interconnected network of blobs and sheets, of scales varying between millimetres and tens of metres.
Instruments have detected magnetic striations closely resembling the magnetic signature of crustal spreading and continental drift on Earth, researchers reported in the journal Science yesterday.
1) experiments to investigate earthquake nucleation by reproducing crustal (pressure, temperature, presence of fluids, stress perturbations, etc.
However, the mechanisms responsible for both the topographic uplift and the crustal thickening remain controversial.
The result gives insight into what allows plate tectonics - the movement of the Earth's crustal plates - to occur.
Eight field trips display the records and recording tools of geological processes such as plate motions, deep crustal structure and deformation, and near-surface processes and interactions between the Earth's surface and climate.