All Igneous rocks share one common characteristic. They ____________. A) have a
ID: 234887 • Letter: A
Question
All Igneous rocks share one common characteristic. They ____________.
A) have a mafic chemistry
B) they reach Earth's surface
C) have a felsic chemistry
D) cool from magma
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Magma tends to move upward, away from where it formed in the crust for two reasons: 1) ___________________, and 2) __________________.
A) buoyancy, overlying rock pressure squeezes magma upward
B) geotherm, chemistry
C) injection, tension
D) convection, advection
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If a volcano erupted and its resultant lava flowed to a great distance at a relatively fast rate, what properties would you expect of the lava?
A) Felsic and viscous
B) mafic and volatile-rich
C) intermediate and viscous
D) Felsic and volatile-rich
E) All of the above are correct.
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Why don’t all igneous rocks contain all the minerals listed in Bowen’s Reaction Series?
A) Minerals degrade with time, leaving only some of the series behind in igneous rocks.
B) A mafic magma may completely crystallize before felsic minerals have a chance to form.
C) Not all of the minerals in the series have the ability to form in every rock.
D) Bowen’s Reaction Series only applies to some igneous rocks, not all.
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Which of the following would help distinguish continental hot spots from oceanic hot spots?
A) the presence of water
B) the presence of both mafic and felsic magmas
C) the presence of other, extinct or active, volcanoes nearby
D) the presence of basalt
Explanation / Answer
D
A
B
B
A
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