Densité des roches Flashcards

1
Q

la distribution des altitudes

A

l’altitude moyenne des continents est à + 300m et l’altitude des océans est à
- 5000m.

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2
Q

nom des 4 roches étudiées

A

-péridotite
-granite
-basalte
gabbros

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3
Q

croûte

A

Couche superficielle de la Terre

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4
Q

densité

A

masse volumique(roche) g.cm^-3/masse volumique(eau) g.cm^-3

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5
Q

masse volumique

A

masse/volume

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6
Q

Quelle est la couche la moins rigide entre lithosphère et asthénosphère ?

A

L’asthénosphère

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7
Q

structure gabbro

A

grenue

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8
Q

structure péridotite

A

grenue

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9
Q

structure basalte

A

microlitique

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10
Q

structure granite

A

grenue

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11
Q

1 cm^3 équivaut à

A

1 mL

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12
Q

classification Gabbro

A

magmatique plutonique

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13
Q

classification Péridotite

A

rien

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14
Q

classification Basalte

A

magmatique volcanique

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15
Q

classification Granite

A

magmatique plutonique

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16
Q

localisation Gabbro

A

croûte océanique (10 km d’épaisseur)

17
Q

localisation Péridotite

A

manteau (de 30/10km à 2800km)

18
Q

localisation Basalte

A

croûte océanique (10 km d’épaisseur)

19
Q

localisation Granite

A

croûte continentale (30 km d’épaisseur)

20
Q

Densité gabbro

A

3 (+)

21
Q

Densité Basalte

A

3 (-)

22
Q

Densité Granite

A

2,3

23
Q

Densité Péridotite

A

3,3 à 3,5