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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 ?
Engine 2 Plant-Strong Stone Baked 100% Whole Wheat Pizza Crusts.
The Pacific and Atlantic oceans are the oldest on Earth, and the oldest large-scale oceanic crusts at their bottoms date back up to about 200 million years ago.
Damascus Bakery has rolled out its ready-to-use Brooklyn Bred brand flatbread pizza crusts and breadsticks.
In the new variant, deliA[degrees] cious hot dogs are baked into the golden crown crusts and drizA[degrees] zled with ketchup and mustard, available with any of the toppings featured in the menu.
ENJOY a slice of the action this weekend by getting a free loaf of Kingsmill Crusts Away
Deep sea cobalt-rich crusts are metal mineral, which is locates in sea mountain [1, 2].
The financing will be used to allow Rustic Crust to place its crusts, frozen flat-bread pizzas, sauce packs and pizza kits in more than 1,000 additional stores across the country.
You can also find organic options and those with whole-wheat crusts.
But while generations of parents have spent hours trying to coax their children into eating the entirety of a piece of bread, dieticians now claim that not only will eating crusts not result in curly hair, but there are in fact no health benefits in them not found in the rest of a slice.
BRITISH kids are such fussy eaters that leftover bread crusts could fill up more than 14 football pitches every day.
Microbiotic crusts are the dominant biological surface feature of arid and semi-arid landscapes (Eldridge and Greene 1994), and are viewed as being beneficial in maintaining soil stability (West 1990), nitrogen fixation (Rogers et al.