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Plate Tectonics 8th Grade Flashcards | StudBud
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Plate Tectonics 8th Grade
Plate Tectonics 8th Grade
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Chapter 9 Test- Plate Tectonics
Flashcards
30 cards
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Practice quiz
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Questions
30
Answers
1
A subduction zone occurs when one ______ plate is forced beneath a second plate.
rift
divergent
convergent
oceanic
2
Occurs when two plates grind past each other without creating or destroying the lithosphere?
divergent boundary
transitional boundary
convergent boundary
transform fault boundary
3
Magnetic reversals.....
provide strong evidence for seafloor spreading
have never occurred during geologic time
confirmed the existence of subduction zones
cause the movements of tectonic plates
4
The Himalayas are an example of what type of plate boundary?
transform fault boundary
convergent oceanic-continental boundary
divergent boundary
convergent continental-continental boundary
5
Plumes of molten rock originating deep within the mantle are known as __________
magma
hot spots
rifts
lithosphere
6
According to the theory of plate tectonics,_________.
the athenosphere is strong and rigid
the asthenosphere is divided into plates
the athenosphere moves over the lithosphere
the lithosphere is divided into plates
7
Which of the following is a geographic example of a transform fault boundary?
Mid-Atlantic Ridge
Andes Mountains
San Andreas Fault
East African Rift valley
8
A divergent boundary at two continental plates can result in a ....
subduction zone
continental volcanic arc
rift valley
volcanic island arc
9
The geographic distribution of the swimming reptile Mesosaurus provides evidence that...
a land bridge existed between Australia and India
South America and Africa were once joined
the Atlantic Ocean was wider when Mesosaurus lived than now
Europe was covered by a shallow sea where Mesosaurus lived
10
How does the age of seafloor sediments change with increasing distance from the ocean ridge?
age decreases
age stays the same
age varies without a pattern
age increases
11
The supercontinent in the continental drift hypothesis was called..
Africa
Panthalassa
Pangea
Mesosaurus
12
What was the main reason Wegener's continental drift hypothesis was rejected?
he could not provide a mechanism for movement of continents
his evidence was incorrect
he could provide only illogical explanations for movement
he was not well liked by other scientists
13
Two plates move together, causing one plate to descend into the mantle beneath the other plate?
transitional boundary
divergent boundary
convergent boundary
transform fault boundary
14
The downward sliding characteristic of ridge-push is the result of...
uneven heat distribution
continental rifting
paleomagnetism
gravity
15
The lithospheric plates move an average of ....
5 inches per year
50 centimeters per year
50 inches per year
5 centimeters per year
16
The thermal convection that drives plate motion is caused by...
seafloor spreading
gravity
an unequal distribution of heat
subduction
17
Which of the following results when divergence occurs between two oceanic plates?
seafloor spreading
an ocean trench
a volcanic island arc
a subduction zone
18
The theory of_______states that Earth's lithosphere is broken into several huge pieces.
transform fault boundary
plate tectonics
mantle plumes
allegiance boundaries
19
You will study for your Plate Tectonics test. True or False
False
True
20
Two plates grind past each other without destroying or producing lithosphere is called what?
divergent boundary
transform fault boundary
convergent boundary
transitional boundary
21
The appearance of hot spots and volcanoes at Earth's surface is evidence of....
mountains
mantle plumes
rifts
rift valleys
22
At a transform fault boundary..
lithosphere is neither destroyed nor produced
new continental crust is formed
new oceanic crust is formed
oceanic lithosphere is detroyed
23
The age of the deepest ocean sediments _____with increasing distance from an ocean ridge crest.
decreases
increases
decreases by 10
stays the same
24
Evidence about ancient climates indicates that...
glacial ice once covered what is now India and Australia
Continents in N hemisphere today were once centered S pole
Continents in S hemisphere today were once centered N pole
No continents occupied the Southern Hemisphere
25
New ocean crust is formed at...
continental volcanic arcs
divergent boundaries
transform fault boundaries
convergent boundaries
26
Oceanic lithosphere is destroyed at...
transform fault boundaries
convergent boundaries
divergent boundaries
ocean ridges
27
Which of the following was NOT used in support of the continental drift hypothesis?
fossil evidence
composition of meteorites
fit of South America and Africa
ancient climate
28
Deep ocean trenches are associated with....
rift zones
ocean ridge systems
subduction zones
transform fault boundaries
29
The main source of downward convection flow in the mantle is called..
slab-push
ridge-pull
ridge-push
slab-pull
30
What forms when one oceanic plate is forced beneath another plate?
a rift valley
an ocean basin
an ocean ridge
a subduction zone
