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WorksheetsDrift, Tectonics and Seafloor Spreading
Total questions: 38
Worksheet time: 10hrs 30mins
The movement of the tectonic plates is caused by
the rotation of the Earth.
convection currents in the asthenosphere
the gravity of the iron-nickel core.
the Moho discontinuity.
Observe this diagram of a plate boundary. One statement BEST describes what is happening. It is that
the oceanic crust is melting.
the denser oceanic crust is subducting under the less dense continental crust
volcanic islands are forming.
the tectonic plates are moving away from each other.
Most geologists think that the movement of Earth’s plates is caused by _______
convection.
continental drift.
subduction.
conduction.
A place where two plates slip past each other, moving in opposite directions, is known as a _______
transform boundary.
divergent boundary.
convergent boundary.
rift valley.
The place where two plates come together is known as a _______
transform boundary.
divergent boundary.
convergent boundary.
rift valley.
Below is a picture of sea-floor spreading. How are the ocean crusts moving?
Converging
Diverging
Sliding
No movement
The San Andreas Fault in California is known as an active earthquake area. What type of
boundary is it?
Converging
Diverging
Transform
Sea Floor Spreading
A divergent boundary occurs where plates ....
Pull apart
Come together
Slide past each other
subducting
How is it possible for new crust to be formed without increasing the surface area of the Earth?
Crust is recycled in subduction zones at the same time it is created at mid-ocean ridges
New crust is underwater where it sinks
New crust breaks more easily than old crust
The oldest crust just breaks apart as the plates move
The average density of continental crust is 2.8 g/cm3 and the average density of oceanic crusts is 3.2 g/cm3. If these two plates came together, what would happen?
The two plates would push apart and form a rift zone.
The oceanic plate would rise up over the continental plate.
The oceanic plate would sink under the continental plate.
The two plates would meet head on and rise up to form mountains.
Scientists use ______ to map the ocean floor
radar
pulsar
lidar
sonar
The OLDEST seafloor is located
closest to the mid-ocean ridge.
farthest from the mid-ocean ridge.
east of Hawaii
west of California
Which of the following supports the theory of seafloor spreading?
Correlation of rock layers
Crustal slab pull
Magnetic reversals recorded in rocks
Continuous mountain chains
Seafloor spreading...
creates new oceanic crust
destroys or recycles crust
creates new continental crust
creates old crust
Rock at the mid ocean ridges...
is the oldest rock on the earth.
is older than continental rock.
is younger than continental rock.
The magnetic pattern of ocean-floor rocks on one side of an ocean ridge is_____________.
a mirror image of that on the other side
younger than other side
much different pattern
at right angles to the ridge
A change in Earth' s magnetic field is called a
magnetic reversal
subduction
paleomagnetism
slab pull
The Pacific Ocean is shrinking because
water is evaporating quickly near the Equator
ocean crust in the Pacific is getting recycled faster than it's being created
it has less glaciers melting into it than the Atlantic
the plates are converging
What is the name of the layer that contains the upper layer of the upper mantle and crust?
Asthenosphere
Mesosphere
Lithosphere
Transosphere
The _________ is the largest layer of the Earth.
Inner Core
Outer Core
Crust
Lower Mantle
What is the rising of hot liquid and the sinking of cooled liquid called?
Confection current
Convention current
Convection current
Lava lamp
