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Plate Tectonics and Volcanoes Flashcards | StudBud
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Plate Tectonics and Volcanoes
Plate Tectonics and Volcanoes
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1
What type of boundary is found between plates A and B?
Divergent
Transform
Convergent
2
Old oceanic crust is more dense than new oceanic crust because it is
closer to the mid ocean ridge
moving toward a deep ocean trench
cool
hot
3
What type of boundary is formed between plates B and C?
Convergent
Transform
Divergent
4
A pyroclastic flow typically occurs during a quiet eruption
True
False
5
The main hazard from a quiet volcanic eruption is
lava flows
volcanic gases
pyroclastic flows
geysers
6
What technology did scientists use in the mid 1900s to map the mid-ocean ridge
deep sea diving
sonar
satelites
submarines
7
What occurs in the mantle that drives plate tectonics?
Radiation
Subduction
Conduction currents
Convection currents
8
According to the diagram, how does plate B's density compare to C's?
More dense
Equal densities
Less dense
9
Before lava reaches the surface, the molten material is called
liquid fire
volcanic ash
rock
magma
10
A rift valley forms at a
transform boundary
divergent boundary
deep ocean trench
convergent boundary
11
Magma sometimes forces its way out of the side of a volcano through a vent.
True
False
12
The main factor that accounts for the difference between quiet and explosive volcanic eruptions
the silica content in the magma
the iron content in the magma
the size of the volcano's magma chamber
the age of the volcano
13
In which location would you most likely find volcanoes?
where two continental plates collide
along transform boundaries
far from plate boundaries
along mid-ocean ridges and where a plate is subducted
14
What is Pangaea?
the name of a German scientist
another name for continental drift
the name of the supercontinent that existed million yearsago
the name of an ancient fossil
15
What feature occurs at X?
deep ocean trench
mid-ocean ridge
subduction
convergent boundary
16
What provides the force that causes magma to erupt to the surface?
the silica in the magma
gravity in the lithosphere
the density of magma
dissolved gases trapped in the magma
17
A place where two plates slip past each other, moving in opposite directions, is known as a
rift valley
divergent boundary
convergent boundary
transform boundary
18
In sea-floor spreading, molten material rises from the mantle and erupts
at the north and south poles
along mid-ocean ridges
along the edges of all the continents
in deep ocean trenches
19
The process by which the ocean floor sinks beneath a deep ocean trench and back into themantle
conduction
continental drift
subduction
convection
20
The theory that states that pieces of Earth's mantle are in constant, slow motion is the theory
of plate tectonics
of sea-floor spreading
of deep ocean trenches
of subduction
21
Mid-ocean ridges form the longest mountain ranges on Earth.
True
False
22
The place where two plates come together is known as a
divergent boundary
transform boundary
convergent boundary
rift valley
23
A collision between two pieces of continental crust at a converging boundary produces a
mountain range
deep ocean trench
rift valley
mid-ocean ridge
24
According to Wegener's hypothesis of continental drift,
the continents were joined together in a single landmass
Earth is slowly cooling and shrinking
the continents do not move
Earth's surface is made up of 7 major landmasses
25
If subduction occurs faster than oceanic crust can be created, an ocean will expand.
False
True
26
Any trace of an ancient organism that has been preserved in rock is called a
fossil
continent
landform
landmass
27
Which of the following statements about mid-ocean ridges is TRUE.
Mid-ocean ridges can be longer than the Rockies and Andes
Mid-ocean ridges were first discovered using submarines
mid-ocean rises are always near the water's surface
Mid-ocean ridges have a flat plateau at their highest point
28
Volcanoes that form along a mid-ocean ridge occur at a diverging plate boundary.
True
False
29
What is happening at point z?
Subduction
Deep ocean trench
Sea floor spreading
Mid-ocean ridge
30
What feature occurs at Y?
Sea floor spreading
rift valley
deep ocean trench
Mid-ocean ridge
31
Oceanic crust near the mid-ocean ridge is younger than crust farther away from the ridge.
False
True
