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Seafloor Spreading
Test Description: Use this to help you review seafloor spreading.
Instructions: Answer all questions to get your test result.
1) The study of Earth's oceans is called
A
Oceanography
B
Geology
C
Aqualogy
D
Continental Drift
2) Large pieces of the lithosphere are called
A
Plates
B
Mid-Ocean Ridges
C
Convection Currents
D
Asthenosphere
3) Chains of undersea mountains are called
A
Lithosphere
B
Ocean Trenches
C
Mantle
D
Mid-Ocean Ridges
4) The process by which molten material adds new oceanic crust to the ocean floor is called
A
Continental Drift
B
Plate Tectonics
C
Seafloor Spreading
D
Subduction
5) The process by which oceanic crust sinks back into the mantle at an ocean trench is called
A
Plate Tectonics
B
Subduction
C
Seafloor Spreading
D
Continental Drift
6) An undersea valley that is the deepest part of the ocean is called
A
Seafloor Spreading
B
Ocean Trench
C
Mid-ocean Ridge
D
Subduction
7) The edges of __________________ seem to mirror the edges of the continents.
A
Mid-ocean ridges
B
Mountains
C
Ocean Trenches
D
Plates
8) Molten rock flows up through a crack in the Earth’s crust and hardens into solid strips of new rock on _________ of the crack.
A
both sides
B
the left side
C
the right side
D
the middle
9) The entire floor on either side of the __________________ moves away (the older strips move farther away over time) like conveyor belts.
A
mid-ocean ridge
B
plate
C
lithosphere
D
ocean trench
10) The ________________________ rocks are located at the mid-ocean ridge.
A
youngest
B
heaviest
C
middle aged
D
oldest
11) The further the distance from the mid-ocean ridge, the _________________ the rock is!
A
stronger
B
heavier
C
younger
D
older
12) If the seafloor is spreading, does that mean that the Earth is getting larger?
A
Yes
B
It depends on the age of the rock.
C
No
D
It depends on how strong the rock is.
13) New oceanic crust is relatively ____________________.
A
warm
B
strong
C
heavy
D
cold
14) As the rock cools and moves away from the mid-ocean ridge, it becomes _________.
A
lighter
B
more dense
C
heavier
D
less dense
15) At _______________________, the more dense oceanic crust will sink under the edge of a continent or a younger, less dense oceanic crust.
A
a volcano
B
an oceanic trench
C
a mid-ocean ridge
D
an earthquake
16) The crust that sinks will be recycled back into the _________________.
A
crust
B
outer core
C
mantle
D
inner core
17) If oceanic crust meets ____________________________, a chain of volcanoes can form.
A
the asthenosphere
B
the mid-ocean ridge
C
continental crust
D
oceanic crust
18) If oceanic crust meets___________________, it can produce a chain of volcanic islands.
A
the mid-ocean ridge
B
continental crust
C
oceanic crust
D
the asthenosphere
*select an answer for all questions
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