Continental Drift and Sea Floor Spreading
Plate Boundaries
Plate Boundaries 2
Plate Boundaries 3
Plate Boundaries 4
Main Feature
100
What is the theory of plate tectonics?
is the theory that Earth's outer crust (lithosphere) is divided into several plates that glide over the plastic-like and less rigid asthenosphere (upper mantle).
100
Diverging
100
What is created when two oceanic crusts diverge?
a mid-ocean ridge (mountains under the ocean)
100
What is created when two oceanic plates converge with each other?
volcanic arc of islands form
100
Name the three types plate boundaries.
Convergent, divergent, transform
100
What main feature does this diagram represent?
The Ring of Fire in the Pacific Ocean
200
What is the Theory of Continental?
The theory that the continents drift.
200
What type of boundary does this diagram represent:
Convergent
200
What is created when two continental crusts diverge?
a rift valley or a ridge
200
Why does ocean crust go below continental crust?
because its more dense
200
What is a real world example of a feature that a convergent plate boundary created?
Folded Mountains Himalayas
200
What is the Ring of Fire?
A long chain of volcanoes that surround the Pacific Ocean
300
What is the theory of Sea-Floor Spreading?
Magma rises on the sea floor causing it to spread. The hot magma rising in the mantle caused the spreading on the sea floor and the large pieces of crust (tectonic plates) to move.
300
What boundary does this diagram represent?
Transform
300
What is created when two plates transform past each other?
a fault which can lead to earthquakes
300
When continental and oceanic crusts converge what forms at the place where the plates collide?
A trench
300
What is a real world example of a feature that a divergent plate boundary created?
Great Rift Valley; Mid-Atlantic Ridge
300
One of the most ________ active areas on ________.
geologically, Earth
400
What scientist developed the Theory of Continental Drift?
Alfred Wegener
400
What type of boundary does this diagram represent?
Divergent
400
What is created when two continental plates converge with each other?
folded mountains
400
What type of boundary does this diagram represent?
Convergent Plate Boundary Subduction (Ocean-Ocean)
400
What is a real world example of a feature that a transform plate boundary created?
San Andreas Fault
400
The Ring of Fire is the site of frequent __________ and __________ ___________.
earthquakes, volcanic eruptions
500
What scientist developed the Theory of Sea Floor Spreading?
Harry Hess
500
When one plate slides below another what type of zone is created?
Subduction Zone
500
What is created when a continental plate converges with an oceanic plate?
volcanoes
500
What type of feature would the following boundary produce? 
Volcanoes
500
What is a subduction Zone?
the oceanic crust usually sinks into the mantle beneath lighter continental crust.
500
The Ring of Fire is caused by plate boundaries _________, _________, and _____________.
converging, diverging, transforming