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1 A surface separating different types of rocks is called:
A) a chill zone.
B) a xenolith.
This is the correct answer.
C) a contact.
D) none of the above
2 The major difference between intrusive and extrusive igneous rocks is:
A) the type of minerals they contain.
This is the correct answer.
B) where they solidify.
C) their chemical composition.
D) all of the above
3 Which is not an intrusive rock type?
This is the correct answer.
A) andesite
B) granite
C) diorite
D) gabbro
4 By definition, stocks differ from batholiths in:
A) elevation above sea-level.
B) chemical composition.
C) shape.
This is the correct answer.
D) size.
5 On average, the geothermal gradient is about:
A) 50 degrees Celsius per kilometer.
This is the correct answer.
B) 30 degrees Celsius per kilometer.
C) 10 degrees Celsius per kilometer.
D) 1 degree Celsius per kilometer.
6 Which of the following minerals is part of Bowen's Continuous Series?
This is the correct answer.
A) plagioclase.
B) amphibole.
C) biotite.
D) pyroxene.
7 Which of the following minerals is part of Bowen's Discontinuous Series?
A) olivine
B) biotite
C) pyroxene
This is the correct answer.
D) All of these are part of Bowen's Discontinuous Series.
8 The difference in texture between plutonic and volcanic rocks is caused by:
A) different chemical compositions.
B) different amounts of water in the magma.
This is the correct answer.
C) different rates of cooling and crystallization.
D) different mineralogy.
9 A change in magma composition due to melting of surrounding country rock is called:
A) differentiation.
B) crystal settling.
This is the correct answer.
C) assimilation.
D) magma mixing.
10 Andesite is most often associated with what type of plate boundary?
A) reversible plate boundaries
This is the correct answer.
B) convergent plate boundaries
C) transform plate boundaries
D) divergent plate boundaries
11 You discover a rock with minerals large enough to be seen containing amphibole, biotite, and plagioclase. This is:
A) hornblende.
B) granite.
C) gabbro.
This is the correct answer.
D) diorite.
12 Bowen’s Reaction Series illustrates relations between:
A) temperature, pressure, and viscosity.
B) viscosity, temperature, silica content, and volatile content.
This is the correct answer.
C) temperature, chemical composition, and mineral structure.
D) temperature, viscosity, and mineral composition.
13 The two important criteria used for igneous rock classification are:
This is the correct answer.
A) texture and mineral composition.
B) temperature and viscosity.
C) mineral composition and temperature.
D) texture and temperature.
14 Basalt and gabbro:
A) formed from magma with the same silica content.
B) formed from magma with the same temperature.
C) have the same minerals.
This is the correct answer.
D) all of these
15 A rock with mineral crystals too small to be seen and low temperature minerals is:
A) granite.
B) andesite.
This is the correct answer.
C) rhyolite.
D) gabbro.
16 Igneous rocks that form entirely beneath Earth's surface are said to be:
A) platonic.
This is the correct answer.
B) plutonic
C) extrusive.
D) volcanic.
17 Andesite was named for a rock type commonly found:
A) in Mayberry, North Carolina.
This is the correct answer.
B) in the Andes Mountains.
C) in Hawaii.
D) in the Rocky Mountains.
18 Igneous processes are those which relate to:
A) solidification of magma.
B) formation of magma.
C) melting of rocks.
This is the correct answer.
D) all of these
19 The geothermal gradient of the asthenosphere is:
A) always changing as a result of plate tectonics.
B) the reverse of the geothermal gradient in the lithosphere.
This is the correct answer.
C) about 1 degree per kilometer.
D) the same as the temperature structure of the lithosphere.
20 Volcanic rocks are also:
A) Explosive.
This is the correct answer.
B) Extrusive.
C) Plutonic.
D) Intrusive.
1 CORRECT All igneous rocks form from magma.
This is the correct answer.
A) TRUE
B) FALSE
Feedback: CORRECT!
2 CORRECT All volcanic rocks are also igneous rocks.
This is the correct answer.
A) TRUE
B) FALSE
Feedback: CORRECT!
3 CORRECT All igneous rocks are composed of minerals.
A) TRUE
This is the correct answer.
B) FALSE
Feedback: CORRECT!
4 CORRECT Igneous rocks with fine-grained texture are also plutonic.
A) TRUE
This is the correct answer.
B) FALSE
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5 CORRECT Igneous rocks that contain olivine solidified at relatively high temperatures.
This is the correct answer.
A) TRUE
B) FALSE
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6 CORRECT Bowen's Reaction Series is a key to understanding igneous rocks.
This is the correct answer.
A) TRUE
B) FALSE
Feedback: CORRECT!
7 CORRECT Bowen's Discontinuous Series contains minerals with similar silicate structures but different chemical compositions.
A) TRUE
This is the correct answer.
B) FALSE
Feedback: CORRECT!
8 CORRECT The size of mineral grains in an igneous rock reveals information about the cooling history of the magma.
This is the correct answer.
A) TRUE
B) FALSE
Feedback: CORRECT!
9 CORRECT By definition, volcanic rocks are those extruded onto Earth's surface.
This is the correct answer.
A) TRUE
B) FALSE
Feedback: CORRECT!
10 CORRECT Pressure is an important variable controlling the formation of magma.
This is the correct answer.
A) TRUE
B) FALSE
Feedback: CORRECT!
11 CORRECT Temperature is an important variable controlling the formation of magma.
This is the correct answer.
A) TRUE
B) FALSE
Feedback: CORRECT!
12 CORRECT Olivine is the first mineral to form in Bowen's Continuous Series.
A) TRUE
This is the correct answer.
B) FALSE
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13 CORRECT In Bowen's Discontinuous Series, more complex silicate structures form as temperature decreases.
This is the correct answer.
A) TRUE
B) FALSE
Feedback: CORRECT!
14 CORRECT All igneous rocks form from magma with the same composition.
A) TRUE
This is the correct answer.
B) FALSE
Feedback: CORRECT!
15 CORRECT Magma formation is common at divergent plate boundaries.
This is the correct answer.
A) TRUE
B) FALSE
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16 CORRECT Deep inside Earth where temperatures are very high, all rocks have melted to form magma.
A) TRUE
This is the correct answer.
B) FALSE
Feedback: CORRECT!
17 CORRECT Andesite is a common igneous rock found in the Andes Mountains of South America.
This is the correct answer.
A) TRUE
B) FALSE
Feedback: CORRECT!
18 CORRECT Some magmas are cool enough for you to touch with your bare hand.
A) TRUE
This is the correct answer.
B) FALSE
Feedback: CORRECT!
19 CORRECT The most common igneous rock in the ocean basins is basalt.
This is the correct answer.
A) TRUE
B) FALSE
Feedback: CORRECT!
20 CORRECT All volcanoes in North America are extinct.
A) TRUE
This is the correct answer.
B) FALSE
Feedback: CORRECT!
NOTE: CONTINUOUS VS DISCONTINUOUS
The continuous branch describes the evolution of the plagioclase feldspars as they evolve from being calcium-rich to more sodium-rich.
The discontinuous branch describes the formation of the mafic minerals olivine, pyroxene, amphibole, and biotite mica.
TERMS:
http://geology.com/minerals/plagioclase.shtml
maf·ic = relating to, denoting, or containing a group of dark-colored, mainly ferromagnesian minerals such as pyroxene and olivine
*PLUTONIC ROCKS are rocks beneath the Earth's crust which is a solidified magma while a volcanic rock is a solidified lava.
The name was taken from the God of the Underworld, Pluto or Hades
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