PHYSICAL GEOLOGY CORE MAIN ANSWERS AND
QUESTIONS SET A+
✔✔Complete the following sentence. The older oceanic crust is,
_____________________.
A the less sediment will cover it
B the more iron it contains
C the more sediment will cover it
D the more likely it is that it will soon transform into continental crust
E the more silicon it contains - ✔✔C
✔✔As water flows upward off of a subducted plate, it causes the melting point of rock in
the upper mantle to go up, thus slowing the rate at which rock melts into magma. -
✔✔False
✔✔Volcanoes formed as a result of oceanic crust subduction are enriched in which of
the following two elements, compared to the upper mantle?
A iron and oxygen
B silicon and oxygen
C iron and magnesium
D silicon and nickel
E oxygen and nickel - ✔✔B
✔✔The sediment that accretes on oceanic crust can only ever reach a maximum
thickness of about 50 meters. - ✔✔False
✔✔Three types of convergent boundaries exist. What are they called?
A desert-mountain, ocean-island, valley-mountain
B ocean-ocean, continent-ocean, continent-continent
C valley-sea, mountain-sea, desert, sea
D None of the choices are correct.
E mountain-sea, sea-sea, mountain-mountain - ✔✔B
, ✔✔The type of rock found at two converging plates is an important factor controlling
what happens at the boundary between them. - ✔✔True
✔✔Mountain building resulting from continent-continent collision is known as:
A subduction
B orogenesis
C the mid-oceanic ridge
D paleomagnetism
E a passive margin - ✔✔B
✔✔When two continental crusts converge, what is the resulting landform? - ✔✔a
mountain range
✔✔When continental crust collides with another continental crust, not only do
mountains form but the crust forms roots, in a sense. This is really just the crust sinking
under the weight of the mountains. - ✔✔True
✔✔India and Tibet were once separated by a vast desert before these two countries
collided and formed the Himalayas. - ✔✔False
✔✔The Himalayan, Ural, and Appalachian mountain systems were all formed as a
result of a continental crust collision. - ✔✔True
✔✔What must always precede a continent-continent collision?
A Ocean and continent must converge.
B Ocean and ocean must converge.
C The poles must have recently switched.
D A major earthquake must occur.
E The Mid-Atlantic Ridge must be particularly active. - ✔✔A
✔✔How long is it estimated that it will take for Los Angeles to be adjacent to San
Francisco?
A 1 million years
B 100 million years
C 50 million years
D 110 million years
E 10 million years - ✔✔E
✔✔Transform boundaries are characterized by frequent earthquakes. - ✔✔True
✔✔The Pacific Plate grinds northward along the edge of the North American Plate at a
rate of about 6 centimeters a year. - ✔✔True
QUESTIONS SET A+
✔✔Complete the following sentence. The older oceanic crust is,
_____________________.
A the less sediment will cover it
B the more iron it contains
C the more sediment will cover it
D the more likely it is that it will soon transform into continental crust
E the more silicon it contains - ✔✔C
✔✔As water flows upward off of a subducted plate, it causes the melting point of rock in
the upper mantle to go up, thus slowing the rate at which rock melts into magma. -
✔✔False
✔✔Volcanoes formed as a result of oceanic crust subduction are enriched in which of
the following two elements, compared to the upper mantle?
A iron and oxygen
B silicon and oxygen
C iron and magnesium
D silicon and nickel
E oxygen and nickel - ✔✔B
✔✔The sediment that accretes on oceanic crust can only ever reach a maximum
thickness of about 50 meters. - ✔✔False
✔✔Three types of convergent boundaries exist. What are they called?
A desert-mountain, ocean-island, valley-mountain
B ocean-ocean, continent-ocean, continent-continent
C valley-sea, mountain-sea, desert, sea
D None of the choices are correct.
E mountain-sea, sea-sea, mountain-mountain - ✔✔B
, ✔✔The type of rock found at two converging plates is an important factor controlling
what happens at the boundary between them. - ✔✔True
✔✔Mountain building resulting from continent-continent collision is known as:
A subduction
B orogenesis
C the mid-oceanic ridge
D paleomagnetism
E a passive margin - ✔✔B
✔✔When two continental crusts converge, what is the resulting landform? - ✔✔a
mountain range
✔✔When continental crust collides with another continental crust, not only do
mountains form but the crust forms roots, in a sense. This is really just the crust sinking
under the weight of the mountains. - ✔✔True
✔✔India and Tibet were once separated by a vast desert before these two countries
collided and formed the Himalayas. - ✔✔False
✔✔The Himalayan, Ural, and Appalachian mountain systems were all formed as a
result of a continental crust collision. - ✔✔True
✔✔What must always precede a continent-continent collision?
A Ocean and continent must converge.
B Ocean and ocean must converge.
C The poles must have recently switched.
D A major earthquake must occur.
E The Mid-Atlantic Ridge must be particularly active. - ✔✔A
✔✔How long is it estimated that it will take for Los Angeles to be adjacent to San
Francisco?
A 1 million years
B 100 million years
C 50 million years
D 110 million years
E 10 million years - ✔✔E
✔✔Transform boundaries are characterized by frequent earthquakes. - ✔✔True
✔✔The Pacific Plate grinds northward along the edge of the North American Plate at a
rate of about 6 centimeters a year. - ✔✔True
