GEOL 1500 EXAM 2 QUESTIONS &
ANSWERS!!
Magma can be produced on earth by melting already hot but solid rocks by reducing
the pressure or by adding additional heat and/or - ANSWERwater
A typical magma includes_______ - ANSWERa hot liquid mixture of element but
primarily silicon and oxygen, dissolved gasses, minerals that are beginning to
crystallize within the magma
Intrusive igneous rocks are also called ______, and extrusive igneous rocks are also
called ________ - ANSWERplutonic, volcanic
Which of these is a very common felsic igneous rock? - ANSWERgranite
which of these is a veery common mafic igneous rock - ANSWERbasalt
Granite Is the main type of rock being erupted as lava flows at the crests of Earth's
oceanic ridge systems, such as that in the Atlantic ocean east of North Carolina. T or
F - ANSWERfalse
Regarding the general chemical composition of the igneous rocks rhyolite and
granite, what is the difference between these two rocks - ANSWERthere is no
difference
Most magma produced in the earth's interior _______ - ANSWERstays below the
surface and forms igneous plutons
Approximately 75% of the earth's active volcanoes are located around the so-called
"ring of fire" that generally encircles the _______ ocean - ANSWERpacific
A volcano's "style" of eruption ("quiet" versus "violent") is mainly controlled
by_________ - ANSWERmagma viscosity
Most magma on earth is formed by intense radioactive melting of mantle rocks. T or
F - ANSWERfalse
Which of these properties does not influence magma viscosity ("stickiness") -
ANSWERmagnetism
Gasses (volatiles) escaping from an erupting magma may produce bubbles
(vesicles) in the solidifying rock. _________ is not a rock with a vesicular texture -
ANSWERGranite Pegmatite
ANSWERS!!
Magma can be produced on earth by melting already hot but solid rocks by reducing
the pressure or by adding additional heat and/or - ANSWERwater
A typical magma includes_______ - ANSWERa hot liquid mixture of element but
primarily silicon and oxygen, dissolved gasses, minerals that are beginning to
crystallize within the magma
Intrusive igneous rocks are also called ______, and extrusive igneous rocks are also
called ________ - ANSWERplutonic, volcanic
Which of these is a very common felsic igneous rock? - ANSWERgranite
which of these is a veery common mafic igneous rock - ANSWERbasalt
Granite Is the main type of rock being erupted as lava flows at the crests of Earth's
oceanic ridge systems, such as that in the Atlantic ocean east of North Carolina. T or
F - ANSWERfalse
Regarding the general chemical composition of the igneous rocks rhyolite and
granite, what is the difference between these two rocks - ANSWERthere is no
difference
Most magma produced in the earth's interior _______ - ANSWERstays below the
surface and forms igneous plutons
Approximately 75% of the earth's active volcanoes are located around the so-called
"ring of fire" that generally encircles the _______ ocean - ANSWERpacific
A volcano's "style" of eruption ("quiet" versus "violent") is mainly controlled
by_________ - ANSWERmagma viscosity
Most magma on earth is formed by intense radioactive melting of mantle rocks. T or
F - ANSWERfalse
Which of these properties does not influence magma viscosity ("stickiness") -
ANSWERmagnetism
Gasses (volatiles) escaping from an erupting magma may produce bubbles
(vesicles) in the solidifying rock. _________ is not a rock with a vesicular texture -
ANSWERGranite Pegmatite
