Download QUIZ 4

QUIZ 4
1) Igneous rocks that form from the cooling of magma within the Earth interior are called
____________________ rocks.
a) intrusive b) extrusive c) sedimentary
d) metamorphic
2) The continental crust is composed or rocks with a chemical composition similar to:
a) basalt
b) gabbro
c) diorite
d) granite
3) Igneous rocks that formed from the fragmented pieces of cooled lava erupted into the
air are called:
a) granites
b) intrusive rocks
c) pyroclastic rocks d) basalts
4) Light colored minerals with low densities are__________________ minerals.
a) felsic
b) intermediate
c) mafic
d) ultramafic
5) Silicate minerals very rich in magnesium and iron are in most cases are called
____________ minerals:
a) felsic
b) intermediate
c) mafic
d) ultramafic e) c and/or d
6) Peridotites are mainly composed of the mineral olivine. They are considered which
type of rock?
a) felsic
b) intermediate
c) mafic
d) ultramafic
7) The extrusive rock with a similar chemical and mineralogical composition to diorite is:
a) basalt
b) gabbro
c) andesite
d) granite
e) dacite
8) All of these parameters control partial melting conditions, EXCEPT for:
a) Pressure
b) Temperature
c) Mineralogy
d) Water
e) Gravity
9) Partial melting temperatures of rocks can be predicted by looking at their composition
alone:
a) True
b) False
10) All factors being equal as the same rock experiences a wer ambient pressure, the
expected partial melting temperature should
a) increase
b) decrease c) remain constant
d) none of these
11) Fractional crystallization occurs because different minerals have different melting
temperatures
a) True b) False
12) A magma derived from partial melting of the mantle is mafic in composition and will
produce mafic minerals upon solidification. However, a felsic magma can also be
produced in the latter stages of the cooling before everything goes solid. The process of
generating a more felsic magma from an originally mafic magma is called…
a) Fractional migmatization b) fractional crystallization c) fractional mineralization d)
magmatic differentiation e) mineral differentiation