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 ?
As can be observed in Figure 5 with the use of fiberglass paper there is no crust formation and the heat transfer between the capsule and the sample is more homogeneous, thus favoring drying.
Vetiver increased soil resistance against raindrops, crust formation and soil erosion probably by binding soil particles, aggregation and creating the macropores.
This behavior could be attributed to the reduced boiling point of water at vacuum conditions and this brought about a slower rate of moisture removal throughout frying leading to reduced structural degradation and less crust formation compared to atmospheric frying.
Similarly, the common findings on nasal examination were crust formation, roomy nasal cavity, turbinate atrophy, septum deviation, nasal bridge depression, pale mucosa, and septal perforation.
At the 1-week follow-up in our study, there were no significant differences between the two groups in the incidence of nasal bleeding, nasal discharge, vestibulitis, and crust formation. In another study by von Schoenberg et al, 3 patients (2.9%) developed vestibulitis while their splints were still in place.
An antibiotic ointment is applied to the treated areas after the procedure, and used as needed until crust formation occurs.
Hess Medal for "outstanding achievements in research of the constitution and evolution of Earth and other planets," notably "his many discoveries, creative efforts and deep insights that have led to the modern understanding of the mantle melting and ocean crust formation along the global ocean ridges."
The scheme comprises a fuzzy controller, based on a rule base, determined with the help of the mathematical model of the crust formation process.
We refer to the index provided by the syringe method as 'infiltrability through simulated crusts' because all the main processes that contribute to crust formation, such as input of mechanical energy, dispersion of clay, slaking of aggregates, and deposition of fine material at the soil surface or within pores, are accommodated in the method.
and Hynes, A., 2000a, The Lithoprobe Abitibi-Grenville transect: two billion years of crust formation and recycling in the Precambrian Shield of Canada: Canadian Journal of Earth Sciences, v.
The oven features sophisticated air-flow and moisture management systems that ensure a high-quality, even bake time after time and allow excellent crust formation. The BX is available in either a compact four-tray or large 10-tray configuration.