LSU GEOL 1001 EXAM 2 ACTUAL QUESTIONS
WITH VERIFIED SOLUTIONS
◉ the igneous feature shown in this figure is a
a. volcanic neck
b. dike
c. sill
d. laccolith.
Answer: c. sill
◉ steep and unstable slopes can produce ____, forming ____.
Answer: landslides and mudflows; volcanic breccia
◉ magma erupted on the surface can form a ____ that cools quickly,
resulting in ____.
Answer: lava flow; volcanic glass
◉ some volcanic ash rises vertically in an ____, cools before
accumulating on the surface, and forms deposits that are ____.
Answer: eruption column; nonwelded
,◉ some volcanic ash forms ____ that accumulate while hot and can
become ____ to some extent.
Answer: pyroclastic flows; welded
◉ which of the following rock types requires dissolved gas in the
magma?
a. andesite
b. pumice
c. granite
d. gabbro
e. diorite.
Answer: b. pumice
◉ which of the following changes in conditions would cause melting
of a solid rock?
a. from A to D
b. from B to C
c. from C to D
d. from A to C
e. from A to B.
,Answer: e. from A to B
◉ On this figure of Bowen's Reaction Series, which mineral would
crystallize last from magma?
a. 4, K-feldspar
b. 2, calcium-rich plagioclase
c. 3, sodium-rich plagioclase
d. 1, olivine.
Answer: a. 4, K-feldspar
◉ magma can partially crystalize at depth and then rise to shallow
depths where the remaining magma solidifies. the early-formed
crystals are ____ and the texture is ____.
Answer: phenocrysts; porphyritic
◉ in ____ very large crystals can grow, forming ____.
Answer: water-rich parts of the magma; pegmatite
◉ magma that cools in ____ has a relatively short time to cool and so
forms ____, but not volcanic glass.
Answer: shallow magma chambers; fine-grained rocks
, ◉ in ____, magma cools at a slow rate, allowing the formation of ____.
Answer: deep magma chambers; coarse-grained rocks
◉ the igneous feature shown in this feature is a
a. volcanic neck
b. laccolith
c. sill
d. dike.
Answer: d. dike
◉ which of the following changes in conditions would represent
heating during burial
a. from C to D
b. from A to C
c. from B to C
d. from D to A
c. from A to B.
Answer: b. from A to C
◉ exceptionally large mineral grains (extra rich in dissolved water).
WITH VERIFIED SOLUTIONS
◉ the igneous feature shown in this figure is a
a. volcanic neck
b. dike
c. sill
d. laccolith.
Answer: c. sill
◉ steep and unstable slopes can produce ____, forming ____.
Answer: landslides and mudflows; volcanic breccia
◉ magma erupted on the surface can form a ____ that cools quickly,
resulting in ____.
Answer: lava flow; volcanic glass
◉ some volcanic ash rises vertically in an ____, cools before
accumulating on the surface, and forms deposits that are ____.
Answer: eruption column; nonwelded
,◉ some volcanic ash forms ____ that accumulate while hot and can
become ____ to some extent.
Answer: pyroclastic flows; welded
◉ which of the following rock types requires dissolved gas in the
magma?
a. andesite
b. pumice
c. granite
d. gabbro
e. diorite.
Answer: b. pumice
◉ which of the following changes in conditions would cause melting
of a solid rock?
a. from A to D
b. from B to C
c. from C to D
d. from A to C
e. from A to B.
,Answer: e. from A to B
◉ On this figure of Bowen's Reaction Series, which mineral would
crystallize last from magma?
a. 4, K-feldspar
b. 2, calcium-rich plagioclase
c. 3, sodium-rich plagioclase
d. 1, olivine.
Answer: a. 4, K-feldspar
◉ magma can partially crystalize at depth and then rise to shallow
depths where the remaining magma solidifies. the early-formed
crystals are ____ and the texture is ____.
Answer: phenocrysts; porphyritic
◉ in ____ very large crystals can grow, forming ____.
Answer: water-rich parts of the magma; pegmatite
◉ magma that cools in ____ has a relatively short time to cool and so
forms ____, but not volcanic glass.
Answer: shallow magma chambers; fine-grained rocks
, ◉ in ____, magma cools at a slow rate, allowing the formation of ____.
Answer: deep magma chambers; coarse-grained rocks
◉ the igneous feature shown in this feature is a
a. volcanic neck
b. laccolith
c. sill
d. dike.
Answer: d. dike
◉ which of the following changes in conditions would represent
heating during burial
a. from C to D
b. from A to C
c. from B to C
d. from D to A
c. from A to B.
Answer: b. from A to C
◉ exceptionally large mineral grains (extra rich in dissolved water).
