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ROCK STRUCTURE [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2002-08-29

English

Subject field(s)
  • Petrography
  • Geomorphology and Geomorphogeny
CONT

A horizons: Mineral horizons which formed at the surface or below an O horizon, in which all or much of the original rock structure has been obliterated and which are characterized by one or more of the following: - an accumulation of humified organic matter intimately mixed with the mineral fraction and not displaying properties characteristic of E or B horizons (see below); - properties resulting from cultivation, pasturing, or similar kinds of disturbance; or - a morphology which is different from the underlying B or C horizon, resulting from processes related to the surface.

CONT

Rock Structure. The structure of the underlying rocks can have a pronounced impact on what landforms ultimately result ....

French

Domaine(s)
  • Pétrographie
  • Géomorphologie et géomorphogénie
CONT

Le paysage de l'Outaouais est marqué par de nombreuses collines de basses altitudes qui font partie du Bouclier canadien. Le bouclier est la région physiographique de structure rocheuse la plus étendue au Canada. Elle est ainsi nommée en raison de sa forme plus ou moins circulaire.

CONT

[...] si le sonar latéral permet une bonne reconnaissance des structures rocheuses et sédimentaires (champs de mégarides, dunes de sable, rubans sableux...), il ne permet pas une identification précise de la nature des sédiments. Par exemple, l'extrait de sonogramme suivant (444ko) semble montrer un fond rocheux, il s'agit en fait d'un banc de crépidules en Baie du Mont Saint-Michel.

CONT

L'Angleterre s'en sort traditionnellement bien lors des basculements de pôles, à cause de ses structures rocheuses sous-jacentes. Stonehenge en est une preuve, qui a subi des séismes violents mais a pu éviter d'être trop secoué, ce qui a souvent un effet des plus destructeurs sur des structures massives.

Spanish

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Record 2 2002-08-29

English

Subject field(s)
  • Petrography
CONT

Metamorphism. Changes over time, in the composition and structure of rocks caused by pressure and temperature.

Key term(s)
  • rock structure

French

Domaine(s)
  • Pétrographie
CONT

Métamorphisme. Phénomènes de chaleur et de pression qui transforment la structure des roches.

Spanish

Save record 2

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