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Sea-Floor Spreading
Test Description: Use this to review the Sea-Floor Spreading theory.
Instructions: Answer all questions to get your test result.
1) What technology did scientists use in the mid-1900s to map the mid-ocean ridge?
A
satellites
B
deep-sea diving
C
sonar
D
submarines
2) In sea-floor spreading, molten material rises from the mantle and erupts
A
along mid-ocean ridges
B
at the north and south poles
C
along the edges of all the continents
D
in deep-ocean trenches
3) Mid-ocean ridges are
A
long deep-ocean trenches
B
found in all of Earth's oceans.
C
located mostly along coastlines
D
found only in the Pacific Ocean.
4) How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?
A
by determining the age of rock samples obtained by drilling on the sea floor
B
by observing eruptions of molten material on the sea floor
C
my measuring how fast sea-floor spreading occurs
D
by mapping rocks on the sea floor using sonar
5) The process by which the ocean floor sinks beneath an deep-ocean trench and back into the mantle is known as
A
continental drift
B
conduction
C
subduction
D
convection
6) Old oceanic crust is more dense than new oceanic crust because it is
A
cool
B
hot
C
conduction
D
moving toward a deep-ocean trench
7) The process of ___________ continually adds new crust to the ocean floor along both sides of the mid-ocean ridge.
A
convection
B
sea-floor spreading
C
plate tectonics
D
continental drift
8) Subduction occurs where the oceanic crust bends down toward the mantle at a(n) ________.
A
transform boundary
B
deep ocean trench
C
divergent boundary
D
mid-ocean ridge
9) The ocean floor sinks beneath a deep-ocean trench and back into the mantle in a process known as ________.
A
convection
B
continental drift
C
subduction
D
plate tectonics
10) The scientist credited with sea-floor spreading is _________
A
Harry Hess, an American geologist
B
Dennis Lieding, a Libertyville social studies teacher
C
J. Tuzo Wilson, a Canadian scientist
D
Alfred Wegener, a German scientist
*select an answer for all questions
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