GEOLOGY 201 MIDTERM #1 EXAM QUESTIONS
WITH VERIFIED ANSWERS
The mineral property of cleavage refers to the:
Splitting of a mineral along planar surfaces
What mineral does not exhibit cleavage?
Quartz
The introduction of "volatiles", such as water released from a subducting slab, does what
to the melting temperature of the overlying rock:
decreases the melting temperature
In Bowen's Reaction Series, at about what approximate temperature do the mafic minerals
begin to crystallize?
1200 degrees Celsius
The uppermost mantle is a rock called:
Peridotite
A geologist is wandering around a Hawaiian beach and finds that the sand grains are black
and green. What minerals are likely making up the observed sand sized grains?
Pyroxene and Olivine
What is one divergent plate boundary?
The East African Rift
A transform plate boundary can be described by:
two plates moving horizontally past one another
What is the approximate silica content of granite?
70%
Which mineral is common in both mafic and felsic igneous rocks?
Plagioclase Feldspar
Repeated partial melting of source material produces magmas that become increasingly:
felsic
Which of the following has the same chemical composition as andesite?
Diorite
WITH VERIFIED ANSWERS
The mineral property of cleavage refers to the:
Splitting of a mineral along planar surfaces
What mineral does not exhibit cleavage?
Quartz
The introduction of "volatiles", such as water released from a subducting slab, does what
to the melting temperature of the overlying rock:
decreases the melting temperature
In Bowen's Reaction Series, at about what approximate temperature do the mafic minerals
begin to crystallize?
1200 degrees Celsius
The uppermost mantle is a rock called:
Peridotite
A geologist is wandering around a Hawaiian beach and finds that the sand grains are black
and green. What minerals are likely making up the observed sand sized grains?
Pyroxene and Olivine
What is one divergent plate boundary?
The East African Rift
A transform plate boundary can be described by:
two plates moving horizontally past one another
What is the approximate silica content of granite?
70%
Which mineral is common in both mafic and felsic igneous rocks?
Plagioclase Feldspar
Repeated partial melting of source material produces magmas that become increasingly:
felsic
Which of the following has the same chemical composition as andesite?
Diorite
