Download CRS_Ch04 - earthjay science

Living with Earth
1st Edition
Classroom Response System
Questions
Chapter 4
© 2011 Pearson Education, Inc.
04.01 Why is it impossible for thick continental crust to
sink into the mantle?
A. The greater amounts of less dense elements, such as
silicon, aluminum, potassium, and sodium make
continental crust very buoyant.
B. Since the continental crust is so dense, it is motionless
while ocean crust moves and sinks into the mantle.
C. Continental crust sits on top of ocean crust, and so it
never sinks into the mantle.
D. Magnetic forces from the core prevent crust from sinking
into the mantle.
E. None of the above
© 2011 Pearson Education, Inc.
04.01 Why is it impossible for thick continental crust to
sink into the mantle?
A. The greater amounts of less dense elements, such
as silicon, aluminum, potassium, and sodium make
continental crust very buoyant.
B. Since the continental crust is so dense, it is motionless
while ocean crust moves and sinks into the mantle.
C. Continental crust sits on top of ocean crust, and so it
never sinks into the mantle.
D. Magnetic forces from the core prevent crust from sinking
into the mantle.
E. None of the above
Answer: A, [p. 85]
© 2011 Pearson Education, Inc.
04.02 Why is quartz such a common mineral?
A. It is a very useful building material, so humans produce
as much as possible in labs.
B. Chemical weathering throughout the world has produced
a large amount of quartz.
C. It is composed of silicon and oxygen (SiO2), the
most abundant elements in the crust.
D. It is composed of calcium, carbon, and oxygen (CaCO3),
the most abundant elements in the crust.
E. It is not very useful, so there are large amounts present.
© 2011 Pearson Education, Inc.
04.02 Why is quartz such a common mineral?
A. It is a very useful building material, so humans produce
as much as possible in labs.
B. Chemical weathering throughout the world has produced
a large amount of quartz.
C. It is composed of silicon and oxygen (SiO2), the
most abundant elements in the crust.
D. It is composed of calcium, carbon, and oxygen (CaCO3),
the most abundant elements in the crust.
E. It is not very useful, so there are large amounts present.
ANSWER: C, [p. 87]
© 2011 Pearson Education, Inc.
04.03 What can you infer about terrain with sinkholes?
A. It is underlain with quartz, easily dissolved by rain
over time.
B. It is underlain with calcite, easily dissolved by rain
over time.
C. It is the location of old quartz mines.
D. It is underlain with feldspar, which caves in easily.
E. None of the above
© 2011 Pearson Education, Inc.
04.03 What can you infer about terrain with sinkholes?
A. It is underlain with quartz, easily dissolved by rain
over time.
B. It is underlain with calcite, easily dissolved by rain
over time.
C. It is the location of old quartz mines.
D. It is underlain with feldspar, which caves in easily.
E. None of the above
ANSWER: B, [p. 95]
© 2011 Pearson Education, Inc.
04.04 You have located a metamorphic rock. According to
the rock cycle (and ignoring where the rock is
located) what could happen to this rock?
A. It could melt and become an igneous rock.
B. It could undergo physical weathering and lithify into
sedimentary rock.
C. It could metamorphose again, becoming a different
metamorphic rock.
D. All of the above
E. None of the above
© 2011 Pearson Education, Inc.
04.04 You have located a metamorphic rock. According
to the rock cycle (and ignoring where the rock is
located) what could happen to this rock?
A. It could melt and become an igneous rock.
B. It could undergo physical weathering and lithify into
sedimentary rock.
C. It could metamorphose again, becoming a different
metamorphic rock.
D. All of the above
E. None of the above
ANSWER: D, [pp. 98-103]
© 2011 Pearson Education, Inc.
04.05 Why would the physical disturbances of aggregate
mining be an environmental concern?
A. They aren’t an environmental concern; people just
overreact.
B. They are taking up land that could be used for
residential areas, thus putting people out of homes.
C. They create large holes in the ground, which are bad
for the environment.
D. They dig too deep and the holes fill up with acid water
from deep beneath the surface, creating acid pools.
E. Mining commonly removes the natural vegetation
from nearby areas and necessitates building
industrial facilities such as shops and processing
plants.
© 2011 Pearson Education, Inc.
04.05 Why would the physical disturbances of aggregate
mining be an environmental concern?
A. They aren’t an environmental concern; people just
overreact.
B. They are taking up land that could be used for
residential areas, thus putting people out of homes.
C. They create large holes in the ground, which are bad
for the environment.
D. They dig too deep and the holes fill up with acid water
from deep beneath the surface, creating acid pools.
E. Mining commonly removes the natural vegetation
from nearby areas and necessitates building
industrial facilities such as shops and processing
plants.
ANSWER: E, [p. 107]
© 2011 Pearson Education, Inc.