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Plate Tectonics Flashcards | StudBud
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Plate Tectonics
Plate Tectonics
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1
What is a mid-ocean ridge?
the continents millions of years ago as a single land mass.
large volcanoes that spew ash and lava.
long chains of mountains that rise up from the ocean floor.
2
divergent boundaries move
back and forward
apart from each other
towards each other
3
What process(es) change the size and shape of the ocean?
subduction and sea-floor spreading
drilling for samples and subduction
sea-floor spreading only
4
In which areas does subduction of the ocean floor take place?
rift valleys
deep-ocean trenches
mid-ocean ridges
the lower mantle
5
An example of a convergent boundary is
The San Andreas Fault
The Himalayas
The Andes
6
What is sea-floor spreading?
More crust added to the ocean floor. Older crust moves out.
An earthquake happens and buildings become unstable.
Waves grow large and crash over a large section of land.
7
Who is Alfred Wegener?
He was an astronomer.
He came up with the Theory of Evolution.
He came up with the idea of Pangea.
8
Subduction is the
process where the ocean floor sinks beneath a d.o.t. & back
process of magma producing magnetized stripes on the Earth
process of plates colliding and creating an earthquake
9
Which features the longest mountain ranges on Earth?
the Rockies
the mid-ocean ridges
the Andes
10
What is the motion of Earth's plates like?
slow and in stages
fast and in stages
slow and constant
11
One piece of evidence that caused Wegener to think that continents moved is
similar fossils found on different continents
he found an old map of the world that showed movement
he observed the continents moving with his own eyes.
12
An example of transform boundaries is
Himalayan mountains
Andes mountains
San Andreas fault
13
Which of the following is evidence for sea-floor spreading?
matching patterns of magnetic stripes on sea floor
pieces of different crust found on different continents
new rock found farther from mid-ocean ridges than older rock
14
Pangea is the idea that
the Earth's plates are in constant slow motion.
the continents used to be joined together in a land mass.
lava creates sea-floor spreading
15
An earthquake may happen when
two plates converge apart from each other
two plates diverge towards each other
two plates grab hold of each other and one slips
