Download the mid-ocean ridge?

Vocabulary
Inside the
Earth
Boundaries
& Faults
Continental Drift
& Alfred Wegener
The theory
Of
Plate Tectonics
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What is a
convergent
boundary?
The place where two
plates come together.
What is the midocean ridge?
A divergent plate
boundary of two
oceanic plates
where the longest
mountain range on
Earth is located
What are
convection
currents?
Currents within the
asthenosphere where less dense
molten material rises and more
dense molten material sinks,
creating currents within our
Earth. Responsible for the
moving of Earth’s plates.
What is the
boundary where
two plates slide past
each other called?
Transform
boundary
What is a trench?
A landform that is created when
two plates collide at a convergent
boundary underwater.
What are the two types
of crust?
Oceanic and continental
crust
What happens to
temperature and
pressure as you move
towards the inner core?
Temperature and pressure
both increase
What are the layers of the Earth from
outside in?
Lithosphere
Asthenosphere
Mesosphere
Outer Core
Inner Core
Crust
Mantle
Outer Core
Inner Core
Where do convection
currents occur?
Asthenosphere
What type of crust is
least dense?
Continental Crust
What type of boundary forms a
reverse fault?
Convergent
What type of landform occurs
when two continental plates
diverge?
A rift valley
What process is occurring
underwater where two oceanic plates
are diverging?
Sea-floor spreading
What type of boundary is a normal
fault and what type of stress/force
causes a normal fault?
A normal fault is a divergent
boundary caused by Tension.
What does each of the following
stand for?
C
R
C
D
N
T
T
S-S
S
Convergent boundary, reverse fault, compression
Divergent boundary, normal fault, tension
Transform boundary, Strike-slip fault, shearing
What is Pangaea?
The name of a supercontinent thought to have
existed millions of years ago
What hypothesis did Alfred
Wegener come up with?
Continental Drift
What evidence did Alfred Wegener
have to support his hypothesis?
-Evidence from landforms (mountain
ranges, coal deposits)
- Evidence from fossils (similar
organisms found in non-similar climates
and very, very far from each other)
- The fact that all the continents sort of
fit together like a puzzle
-Evidence from climate (fossils and coal
deposits)
What evidence did Wegener lack, which made
people not believe his hypothesis?
He could not explain how the continents
moved
What was the name of the two
continents that Pangaea broke up
into?
Laurasia and
Gondwana
What is responsible for moving
Earth’s plates?
Convection currents
What forms on land where two
continental plates collide
(converge)?
Mountains
What is the name of the chain of
volcanic activity surrounding the
pacific plate?
The Ring of
Fire
What happens when a oceanic and
continental plate collide?
Because the oceanic plate is denser when it collides with a
continental plate it will subduct (dive below) going back
down into the mantle, forming what is known as a subduction
zone.
What is the difference between
sea-floor spreading and the mid
ocean ridge?
Sea-floor spreading is the process in which
new oceanic crust is being made as two plates
diverge and magma reaches the surface.
The mid ocean ridge is the name of the
landform where sea-floor spreading is
occurring. It is also the longest chain of
mountains in the world!