As Geology - Igneous Rocks

A quick quiz on Igneous rocks in As geology, hope it helps! :)

Read the questions carefully!

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  • Created by: lol
  • Created on: 25-04-11 14:07
How do igneous rocks form?
Cooling magma on or within the earths surface
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The difference between lava and magma is:
Lava is magma on the earths surface
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Intrusions and Extrusions
Form below and above the surface respectively
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The texture of igneous rocks is generally described as:
Crystaline
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On a geological map, a horizontal igneous body has what markings to show its dip?
Small crosses
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The definitions of fine, medium and coarse crystals are what: (respectively)
Under 1mm, 1 - 3mm, Over 3mm
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Generally, which have a higher density?
Mafic Rocks
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Silicic Minerals include:
Feldspar, Quartz, Muscovite Mica
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One rock is classed as 'Ultramafic'. Which is it?
Peridotite
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For 3 coarse crystal rocks, the order from most Silicic to most Mafic goes:
Granite - Diorite - Gabbro
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Rocks containing a lot of Silica (SiO3) Create what kind of lava?
Thick, slow moving lava
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What are fragments of foreign rock in igneous bodies called?
Xenoliths
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Viscous Lava is likely to create what kind of volcano?
Composite (Strato) Volcanoes
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Mafic minerals include:
Olivine, Pyroxene, Biotite Mica
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Other cards in this set

Card 2

Front

The difference between lava and magma is:

Back

Lava is magma on the earths surface

Card 3

Front

Intrusions and Extrusions

Back

Preview of the front of card 3

Card 4

Front

The texture of igneous rocks is generally described as:

Back

Preview of the front of card 4

Card 5

Front

On a geological map, a horizontal igneous body has what markings to show its dip?

Back

Preview of the front of card 5
View more cards

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