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Continental Drift and Sea-Floor Spreading Review 2025 Flashcards | StudBud
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Continental Drift and Sea-Floor Spreading Review 2025
Continental Drift and Sea-Floor Spreading Review 2025
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Middle School Science - Plate Tectonics
Flashcards
28 cards
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Questions
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Answers
1
Why does oceanic crust subduct under continental crust?
Ocean crust is more dense than continental crust
Ocean crust is less dense than continental crust
Ocean crust is older than continental crust
Ocean crust is younder than continental crust
2
What is the land feature called where subduction takes place in the ocean?
volcanoe
ridge
trench
mountain
3
Why are fossils a good type of evidence for Continental Drift?
They were very old
They were many types of fossils
They were organisms that could not swim across the ocean
They were organisms that lived a long time.
4
Earth's plates carry only the continents.
false
true
5
What was the name of the Super continent?
Pangaea
Colonies
Eurasia
America
6
What is a Mid-ocean ridge?
The black smoke coming out of the picture
Subduction zone coastal volcano
Hot spot volcano
An underwater mountain system formed by plate tectonics.
7
What force moves the plates?
magnetism
convection currents
the sun
gravity
8
The ocean floor is renewed every 200 years.
True
False
9
What evidence supported that there was a climate change for many land masses?
tropical plant fossils & glacier striations
glacier striations
Tropical plant fossils
mountain ranges
10
Where are the youngest rocks?
on both sides of the mid-ocean ridge (G)
on the side of the island (A)
In the mantle underneath the ocean plates (f)
right by the trench before it subducts (B)
11
What is the force (process) that moves the plates?
earthquakes
subduction
convection currents
water cycle
12
The molten material that comes up through the ridge to create new ocean floor
comes from the continetal crust
comes from the core
comes from the mantle
all three
13
Which scientist came up with the Theory of Continental Drift?
Alfred Wegener
Isaac Newton
Albert Einstein
Henry Hess
14
What scientist is given credit for sea-floor spreading?
Askins
Hess
Wagener
Newton
15
Scientist rejected Wegener's Theory of Continental Drift because he could not
explain why oceanic crust is less dense
He couldn't take pictures of them moving
explain the force that pushed or pulled the continents
Technology needed to be improved
16
What is the process being shown in the diagram?
convection currents
continental drift
sea floor spreading
density
17
The following image shows the Seafloor Spreading evidence called:
Magnetic Strips.
Age of the Rock.
Cracks in the ocean that are similar to the continents.
Amount of sediment.
18
The lithosphere is broken into sections called
plates
land
crust
trench
19
What is seafloor spreading?
Movement & spreading of ocean crust above continental crust.
Spreading of ocean crust solely due to earthquakes.
Formation of new ocean crust as result of magma pushing up.
20
What evidence supported the Theory of Continental Drift?
Land Features
climate Change
Fossil pattern
All three
21
Subduction is....
process by which oceanic crust sinks beneath the trenches
the process that continually adds ocean floor
the direct transfer of heat through solids materials
a device that bounces sound wave off underwater objects
22
The process that continually adds new material to the ocean floor is called
continental drift
convection currents
sea-floor spreading
plate tectonics
23
What is the land feature in the ocean where sea-floor spreading occurs?
subduction Zone
trench
convection current
mid-ocean ridge
24
What is NOT evidence that supports seafloor spreading -
fossils
strange shape of rocks by ridge and sediments further out
relative age of rocks (youngest/oldest)
reversal of magnetism in rocks
25
The Atlantic Ocean is expanding.
False
True
26
When ocean crust and continental crust converge(collide)
the ocean crust goes over the continental crust
ocean crust & continental crust subduct back into the mantle
The ocean crust makes a trench and goes over the continental crust
the ocean crust subducts under the continental crust
27
What advancement in technology helped with collecting evidence to support sea-floor spreading?
sonar
cell phones
drills
submarines
28
What type of plate boundary does seafloor spreading occur? (blue vectors)
Divergent
All 3 of the choices
Convergent
Transform
