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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
deep-sea diving
B
satellites
C
submarines
D
sonar
2) In sea-floor spreading, molten material rises from the mantle and erupts
A
along the edges of all the continents
B
in deep-ocean trenches
C
at the north and south poles
D
along mid-ocean ridges
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 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
my measuring how fast sea-floor spreading occurs
5) The process by which the ocean floor sinks beneath an deep-ocean trench and back into the mantle is known as
A
subduction
B
conduction
C
convection
D
continental drift
6) Old oceanic crust is more dense than new oceanic crust because it is
A
cool
B
moving toward a deep-ocean trench
C
hot
D
conduction
7) The process of ___________ continually adds new crust to the ocean floor along both sides of the mid-ocean ridge.
A
sea-floor spreading
B
continental drift
C
convection
D
plate tectonics
8) Subduction occurs where the oceanic crust bends down toward the mantle at a(n) ________.
A
deep ocean trench
B
divergent boundary
C
mid-ocean ridge
D
transform boundary
9) The ocean floor sinks beneath a deep-ocean trench and back into the mantle in a process known as ________.
A
plate tectonics
B
subduction
C
convection
D
continental drift
10) The scientist credited with sea-floor spreading is _________
A
Dennis Lieding, a Libertyville social studies teacher
B
J. Tuzo Wilson, a Canadian scientist
C
Alfred Wegener, a German scientist
D
Harry Hess, an American geologist
*select an answer for all questions
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