Igneous Rocks Question Preview (ID: 45892)


Igneous Rock Review. TEACHERS: click here for quick copy question ID numbers.

Which characteristic provides the best evidence that this pegmatite solidified deep underground?
a) low density
b) light color
c) felsic composition
d) very coarse texture

Which intrusive igneous rock could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole?
a) granite
b) rhyolite
c) gabbro
d) basalt

What is the origin of fine-grained igneous rock?
a) lava that cooled slowly on Earth's surface
b) lava that cooled quickly on Earth's surface
c) silt that settled slowly in ocean water
d) silt that settled quickly in ocean water

Which igneous rock has a vesicular texture and contains the minerals potassium feldspar and quartz?
a) andesite
b) pumice
c) pegmatite
d) scoria

Which igneous rock is dark colored, cooled rapidly on Earth's surface, and is composed mainly of plagioclase feldspar, olivine, and pyroxene?
a) obsidian
b) rhyolite
c) gabbro
d) scoria

Obsidian's glassy texture indicates that it formed
a) slowly, deep below Earth's surface
b) slowly, on Earth's surface
c) quickly, deep below Earth's surface
d) quickly, on Earth's surface

Mineral crystals of quartz, biotite mica, and amphibole are produced primarily by the
a) chemical reaction of elements in seawater
b) cooling and solidification of magma
c) deposition of sediments by a glacier
d) metamorphism of bituminous coal

Which processes lead directly to the formation of igneous rock?
a) weathering and erosion
b) compaction and cementation
c) heat and pressure
d) melting and solidification

Which characteristic provides the best evidence that this pegmatite solidified deep underground?
a) low density
b) light color
c) felsic composition
d) very coarse texture

Which texture best describes an igneous rock that formed deep underground?
a) glassy
b) vesicular
c) fine grained
d) coarse grained

Which process could lead directly to the formation of pumice rock?
a) precipitation of minerals from evaporating seawater
b) metamorphism of unmelted rock material
c) deposition of quartz sand
d) explosive eruption of lava from a volcano

When granite melts and then solidifies, it becomes
a) a sedimentary rock
b) an igneous rock
c) a metamorphic rock
d) sediments

Which common rock is formed from the solidification of molten material?
a) rock gypsum
b) rhyolite
c) slate
d) coal

Which process is necessary for the formation of igneous rocks?
a) erosion
b) deposition
c) solidification
d) metamorphism

Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment?
a) layers of rounded fragments
b) distorted bands of large mineral crystals
c) noncrystalline glassy texture
d) mineral cement between grains

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