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GRANITIC LAYER [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-05-09

English

Subject field(s)
  • Geology
DEF

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 Mohorovicic discontinuity.

CONT

Earth's outermost, rigid, rocky layer is called the crust. It is composed of low-density, easily melted rocks; the continental crust is predominantly granitic rock, while composition of the oceanic crust corresponds mainly to that of basalt and gabbro. Analyses of seismic waves, generated by earthquakes within Earth's interior, show that the crust extends about 50 km(30 miles) beneath the continents but only 5-10 km(3-6) miles beneath the ocean floors.

CONT

In composition, the Earth is made of three nested spheres. At the center of the Earth, a body of intensely hot iron and nickel forms the core. A less dense and much larger middle sphere is made of materials rich in iron, magnesium and calcium comprises the mantle. The outermost layer is a thin veneer of lighter rocks called the crust.

French

Domaine(s)
  • Géologie
DEF

Couche de roches située près de la surface de la Terre.

CONT

Au cours des temps géologiques, l'écorce se différencia en une croûte continentale formée principalement de roches granitiques [...] et en une croûte océanique formée de roches basaltiques [...] La limite entre le manteau et l'écorce est appelé discontinuité de Mohorovicic ou Moho.

CONT

La partie la plus superficielle de la partie solide [de la Terre] c'est la croûte. Sous les océans, elle ne dépasse pas sept kilomètres d'épaisseur, alors que sous les continents, elle varie entre 20 et 70 kilomètres.

Spanish

Campo(s) temático(s)
  • Geología
DEF

Parte superior de la envolvente externa del globo terráqueo, que yace sobre el manto a lo largo de la discontinuidad de Mohorovicic.

OBS

Constituye el 1 por 1 000 del volumen de la Tierra, con un grosor bastante variable.

Save record 1

Record 2 2004-10-26

English

Subject field(s)
  • Plate Tectonics
DEF

... the upper layer of the Earth’s crust, composed of rocks that are rich in silica and alumina.

OBS

Sial is the less dense continental crust. It is called sial because it’s rich in silica and aluminium. It is composed of granitic rocks that form the continents.

OBS

granitic layer : A synonym of sial, so named for its supposed petrologic composition.

French

Domaine(s)
  • Tectonique des plaques
DEF

[...] couche de la lithosphère composée en grande partie de silicates d'aluminium.

CONT

Le Sial ne forme pas une couche continue, mais des blocs isolés qui flottent sur la couche inférieure ou Sima [...]

OBS

sial : terme [...] introduit en 1909 (abréviation de silice-aluminium) [...] La terre était alors considérée comme formée de trois couches concentriques : sial, sima et nife. Ancienne orthographe : sal.

Spanish

Campo(s) temático(s)
  • Tectónica de placas
DEF

Parte superficial de la corteza terrestre, en cuya composición predominan la sílice y la alúmina.

CONT

El sial, voz formada con las primeras letras de las palabras sílice y alúmina, consta sobre todo de granito y granodioritas. Su densidad es, en promedio, de 2,7, lo cual hace que flote en cierto modo sobre el sima, más denso, del cual se halla separado por la discontinuidad de Conrad.

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Record 3 2001-01-26

English

Subject field(s)
  • Peace-Keeping Operations
  • Arms Control
  • Vulcanology and Seismology
DEF

A short period, higher-mode surface wave, that travels over long paths in the continental crust only; the "g" refers to the granitic layer.

French

Domaine(s)
  • Opérations de maintien de la paix
  • Contrôle des armements
  • Volcanologie et sismologie
OBS

Reproduit du lexique «Disarmament and Peace Keeping/Désarmement et Maintien de la Paix» avec l'autorisation de l'Office des Nations Unies à Genève.

Spanish

Save record 3

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