A(n) ________ is a silicate structure where no silica tetrahedra share any oxygen ions.
answer
independent
question
Silica tetrahedra are able to link into long chains that share oxygen ions through the process of ________.
answer
polymerization
question
Where do ultramafic rocks form?
answer
upper mantle
question
Based on the diagram shown in the video, name two minerals that are unlikely to coexist in the same igneous rock.
answer
Muscovite and Pyroxene
question
Igneous rocks of felsic composition have ______ and _____ relative to mafic igneous rocks.
answer
Greater silica, Lower melting temperature
question
Which of the following is true about mafic igneous rocks?
answer
Mafic igneous rocks are rich in Fe, Mg, and Ca.
question
You have found a mafic rock with a phaneritic texture. What is a potential rock name?
answer
gabbro
question
Based on what you learned in this video, what minerals make up rhyolite?
answer
Quartz, K-feldspar, and plagioclase feldspars, with relatively fewer biotite and amphiboles
question
Fill in the blanks using the choices below: ____ are minerals typically found in igneous rocks that have a high silica content, whereas ____ are minerals that are typically found in igneous rocks with a low silica content.
answer
Plagioclase feldspar and quartz; pyroxene and olivine
Slow cooling produces large crystals, whereas fast cooling produces small crystals.
question
What is the geologic definition of texture?
answer
Size, shape, and arrangement of mineral grains in the sample
question
What creates the small holes found in a vesicular texture?
answer
Volatiles
question
Which of the following best describes a pegmatitic texture?
answer
Large crystals that form in a fluid-rich environment late in crystallization
question
An igneous rock with a ______ texture solidified deep within Earth.
answer
phaneritic
question
What factors influences the texture of an igneous rock?
answer
the rate at which the rock cools, the amount of silica that is present in the magma from which it forms, and the amount of dissolved gases present in said magma
question
granite
answer
Intrusive igneous rocks
question
diorite
answer
Intrusive igneous rocks
question
rhyolite
answer
Extrusive igneous rocks
question
Andesite porphyry.
answer
Porphyritic igneous rocks
question
What is one way a glassy texture forms?
answer
Lava cools rapidly.
question
Which of the following describes a texture containing bubble-shaped cavities?
answer
Vesicular
question
Which of the following textures describes an igneous rock with anomalously large crystals?
answer
pegmatitic
question
What does an igneous rock with a pyroclastic texture tell a geologist?
answer
The rock was likely formed by a violent volcanic eruption.
question
Which of the following textures indicates two stages of cooling and crystallization?
answer
porphyritic
question
How are igneous rocks formed?
answer
Igneous rocks are formed by the cooling and crystallization of molten rock.
question
Intrusive and extrusive igneous rocks are classified based on what criteria?
answer
How quickly the molten rock cools and crystallizes, and where this occurs with respect to Earth's surface.
question
What is required to generate an igneous rock with a fine-grained texture?
answer
A fine-grained texture is the product of rapid cooling and crystallization of lava.
question
A phaneritic texture is characteristic of a(n) __________ igneous rock that cooled __________.
answer
intrusive
below the surface
question
What does it mean if an igneous rock has an aphanitic texture?
answer
The igneous rock exhibits mineral crystals too small to see with the naked eye.
Haven't found what you need?
Search for quizzes and test answers now
Quizzes.studymoose.com uses cookies. By continuing you agree to our cookie policy