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Science 9 Chapter 9

Science 9 Chapter 9 Practice Test - Plate Tectonics
 
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Science 9 Chapter 9 Practice Test - Plate Tectonics

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Wegener’s continental drift hypothesis stated that all the continents once joined together to form ____.
a.
two major supercontinents
b.
two major supercontinents and three smaller continents
c.
one major supercontinent
d.
three major supercontinents
 

 2. 

Evidence about ancient climates indicates that ____.
a.
glacial ice once covered much of what is now India and Australia
b.
continents in the Northern Hemisphere today were once centered over the South Pole
c.
continents in the Southern Hemisphere today were once centered over the North Pole
d.
no continents occupied the Southern Hemisphere
 

 3. 

According to the theory of plate tectonics, ____.
a.
the asthenosphere is divided into plates
b.
the lithosphere is divided into plates
c.
the asthenosphere moves over the lithosphere
d.
the asthenosphere is strong and rigid
 

 4. 

Which of the following statements correctly describes the asthenosphere?
a.
It is a thin, cold, and rigid layer.
b.
It is the source of Earth’s heat.
c.
It permits plate motion.
d.
It occurs only near subduction zones.
 

 5. 

A tectonic plate consists of ____.
a.
the crust and uppermost mantle
b.
the oceanic and continental crust only
c.
the crust and entire mantle
d.
the asthenosphere only
 

 6. 

In the plate tectonic theory, a plate can be made up of ____.
a.
continental lithosphere only
b.
oceanic lithosphere only
c.
both continental and oceanic lithosphere
d.
both continental and oceanic asthenosphere
 

 7. 

What kind of plate boundary occurs where two plates grind past each other without destroying or producing lithosphere?
a.
divergent boundary
c.
transitional boundary
b.
convergent boundary
d.
transform fault boundary
 

 8. 

What type of boundary occurs where two plates move together, causing one plate to descend into the mantle beneath the other plate?
a.
transform fault boundary
c.
convergent boundary
b.
divergent boundary
d.
transitional boundary
 

 9. 

Which of the following is most responsible for the formation of new crust at the edge of a tectonic plate?
a.
mountain building at a continent-continent convergent boundary
b.
magma rising up from the mantle at a divergent boundary
c.
two tectonic plates sliding past one another at a transform boundary
d.
subduction of one oceanic plate under another at a convergent boundary
 

 10. 

Which of the following results when divergence occurs between two oceanic plates?
a.
seafloor spreading
c.
an ocean trench
b.
a subduction zone
d.
a volcanic island arc
 

 11. 

A rift valley is evidence of which kind of plate boundary?
a.
convergent
c.
transform
b.
divergent
d.
uniform
 

 12. 

Deep ocean trenches are associated with ____.
a.
ocean ridge systems
c.
transform fault boundaries
b.
subduction zones
d.
rift zones
 
 
nar001-1.jpg
 

 13. 

What type of plate boundary is illustrated in Figure 9-1?
a.
transform fault boundary
b.
divergent boundary
c.
convergent oceanic-oceanic boundary
d.
convergent oceanic-continental boundary
 

 14. 

What feature is labeled B in Figure 9-1?
a.
trench
c.
volcanic island arc
b.
ocean ridge
d.
continental volcanic arc
 

 15. 

What process is illustrated by the area labeled G in Figure 9-1?
a.
seafloor spreading
c.
rifting
b.
continental volcanism
d.
subduction
 

 16. 

Oceanic lithosphere is destroyed at ____.
a.
transform fault boundaries
c.
ocean ridges
b.
divergent boundaries
d.
convergent boundaries
 

 17. 

The convergence of two continental plates would produce
a.
island arcs.
c.
folded mountains.
b.
rift valleys.
d.
trenches.
 

 18. 

Volcanic island arcs are associated with what type of plate boundary?
a.
divergent boundary
b.
convergent continental-continental boundary
c.
convergent oceanic-continental boundary
d.
convergent oceanic-oceanic boundary
 

 19. 

Continental volcanic arcs are associated with what type of plate boundary?
a.
convergent continental-continental boundary
b.
convergent oceanic-continental boundary
c.
transform fault boundary
d.
convergent oceanic-oceanic boundary
 

 20. 

If a deep ocean trench is located adjacent to a continent, active volcanoes would likely be found ____.
a.
seaward from the trench
c.
at the ends of the trench
b.
along the axis of the trench
d.
landward from the trench
 

 21. 

Why are subduction zones not commonly found at convergent continental-continental boundaries?
a.
Continental lithosphere is too buoyant to be forced down into the mantle.
b.
Subduction zones are never found at convergent boundaries.
c.
Oceanic lithosphere is too buoyant to be forced down into the mantle.
d.
Continental lithosphere is too dense to be forced down into the mantle.
 

 22. 

At a transform fault boundary, ____.
a.
new oceanic crust is formed
b.
oceanic lithosphere is destroyed
c.
lithosphere is neither destroyed nor produced
d.
new continental crust is formed
 

 23. 

According to the property of paleomagnetism, ____.
a.
iron-rich rocks show the location of the magnetic poles at the time of their formation
b.
all rocks, regardless of when they are formed, have the same polarity
c.
all rocks have a reversed polarity
d.
rocks do not possess magnetic properties
 

 24. 

Strips of alternating magnetic polarities found in rocks in the ocean basins ____.
a.
conflict with the theory of plate tectonics
b.
provide evidence that Earth’s magnetic field has never reversed polarity
c.
indicate changes in Earth’s gravitation field
d.
provide evidence for seafloor spreading
 

 25. 


mc025-1.jpg
At which location would earthquakes be least likely to occur?
a.
1
c.
3
b.
2
d.
4
 

 26. 

Earthquake activity in California is primarily caused by
a.
the lowering of aquifer levels.
b.
the interaction of tides with the coast.
c.
mining activity during the nineteenth century.
d.
plates grinding past each other along active faults.
 

 27. 

The Hawaiian Islands were formed when the Pacific Plate moved over ____.
a.
a subduction zone
c.
the Aleutian Plate
b.
an ocean ridge
d.
a hot spot
 

 28. 

The youngest rocks on the ocean floor are typically located near what feature?
a.
a mid-ocean ridge
c.
an abyssal plain
b.
a continental shelf
d.
a subduction trench
 

 29. 

How does the age of seafloor sediments change with increasing distance from the ocean ridge?
a.
Age decreases.
c.
Age increases.
b.
Age stays the same.
d.
Age varies without a pattern.
 

 30. 

The main source of downward convection flow in the mantle is called ____.
a.
ridge-pull
c.
slab-push
b.
slab-pull
d.
ridge-push
 
 
nar002-1.jpg
 

 31. 

What feature is labeled A in Figure 9-2?
a.
subduction zone
c.
volcanic island arc
b.
trench
d.
continental volcanic arc
 

 32. 

The thermal convection that drives plate motion is caused by ____.
a.
seafloor spreading
c.
gravity
b.
an unequal distribution of heat
d.
subduction
 



 
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