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Ch. 6 Plate Tectonics
Test Description: Test review for plate tectonics, continental drift, sea-floor spreading, subduction, Pangaea, etc.
Instructions: Answer all questions to get your test result.
1) According to Wegener's hypothesis of continental drift,
A
Earth's surface is made up of seven major landmasses.
B
the continents were once joined together in a single landmass.
C
the continents do not move.
D
Earth is slowly cooling and shrinking.
2) What is Pangaea?
A
another name for continental drift
B
the name of a German scientist.
C
the name of the super-continent that existed millions of years ago.
D
the name of an ancient fossil
3) Any trace of an ancient organism that has been preserved in rock is called a
A
landform
B
fossil
C
continent
D
landmass
4) What technology did scientists use in the mid-1900s to map the mid-ocean ridge?
A
sonar
B
deep-sea diving
C
satellites
D
submarines
5) In sea-floor spreading, molten material rises from the mantle and erupts
A
in deep-ocean trenches
B
at the north and south poles
C
along mid-ocean ridges
D
along the edges of all continents
6) Old oceanic crust is more dense than new oceanic crust because it is
A
hot
B
closer to the mid-ocean ridge
C
moving toward a deep-ocean trench
D
cool
7) Most geologists think that the movement of Earth's plates is caused by
A
Earth's magnetic field.
B
earthquakes
C
conduction
D
convection currents in the mantle
8) The geological theory that states that pieces of Earth's lithosphere are in constant, slow motion is the theory of
A
deep-ocean trenches
B
sea-floor spreading
C
plate tectonics
D
subduction
9) A place where two plates slip past each other, moving in opposite directions, is known as a
A
transform boundary
B
divergent boundary
C
rift valley
D
convergent boundary
10) A collision between two pieces of continental crust at a convergent boundary produces a
A
mountain range
B
deep-ocean trench
C
rift valley
D
mid-ocean ridge
11) How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?
A
by mapping rocks on the sea floor using sonar
B
by observing eruptions of molten material on the sea floor.
C
by determining the age of rock samples obtained by drilling on the sea floor
D
by measuring how fast sea-floor spreading occurs
12) Wegener believed that the continents had once been joined in one landmass called ________.
A
Eurasia
B
Pangaea
C
Tectonic Plates
D
Earth
13) The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle is known as
A
subduction
B
convection
C
continental drift
D
conduction
14) A rift valley forms at a
A
deep-ocean trench
B
divergent plate boundary
C
transform boundary
D
convergent plate boundary
15) The place where two plates come together is known as a
A
rift valley
B
divergent boundary
C
transform boundary
D
convergent boundary
16) If subduction occurs faster than oceanic crust can be created, an ocean will
A
shrink
B
never change
C
stay the same
D
expand
17) Oceanic crust near the mid-ocean ridge is ___________ than oceanic crust farther away from the ridge.
A
younger
B
the same
C
harder
D
older
18) The hypothesis of _______________ was that all the continents once were joined as a single supercontinent and have since drifted apart.
A
plate tectonics
B
convection currents
C
continental drift
D
Pangaea
19) The process of __________________ continually adds new crust to the ocean floor along both sides of the mid-ocean ridge.
A
sea-floor spreading
B
rift valley
C
deep-ocean trench
D
subduction
20) The lithosphere is broken into sections called ________________, which float on top of the asthenosphere.
A
plates
B
continents
C
oceans
D
crust
*select an answer for all questions
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