Igneous rocks quiz

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1 point

All other factors being equal, intrusive rocks that form deep within Earth ____________ than intrusive rocks that cool near the surface.

are more felsic

contain a smaller proportion of volatiles

cool more slowly

cool more rapidly

1 point

An igneous rock with a mixed texture of coarse grains (phenocrysts) surrounded by fine crystals (groundmass) is termed ____________.

porphyritic

phaneritic

aphanitic

necrotic

1 point

The difference between lava and magma is that ____________.

magma is light in color and lava is dark

magma usually has mafic composition and lava usually has felsic composition

magma is found beneath the Earth's surface, whereas lava has reached the surface

magma flows more quickly than lava

1 point

When magma crystallizes, ____________ are formed.

intrusive igneous rocks

extrusive igneous rocks

volatiles

pyroclastic debris

1 point

When rock is partially melted, the chemistry of the melt is ____________.

more mafic than the original chemistry of the rock that was partially melted

more felsic than the original chemistry of the rock that was partially melted

identical to the original chemistry of the rock that was partially melted

completely unpredictable (it could be more mafic or more felsic)

1 point

If a body of magma becomes more felsic, its viscosity will ____________.

increase

decrease

stay the same

1 point

As compared to coarse-grained igneous rocks, all fine-grained igneous rocks ____________.

cool and solidify more quickly

cool and solidify more slowly

solidify at higher temperatures

solidify at lower temperatures

1 point

Igneous rocks ____________.

are formed through the freezing of melt

can be produced at the surface of the Earth as well as deep below the surface

are the most common type of rocks within Earth

all of the above

1 point

In Bowen's discontinuous reaction series, the first mineral to crystallize from a mafic melt is ____________.

olivine

plagioclase

pyroxene

quartz

10.

1 point

Coarse-grained granite is most similar in mineral composition to fine-grained ____________.

andesite

basalt

komatiite

rhyolite

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