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 island arcs
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 idea of Continental?
The idea that the continents drifted into the places they are today
200
What type of boundary does this diagram represent:
Convergent
200
What is created when two continental crusts diverge?
a rift valley
200
Why does oceanic 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
If we were hovering over the Mid-Atlantic Ridge looking west toward Myrtle Beach, where would the newest crust found?
right at the Mid-Atlantic Ridge
300
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.
What is the theory of Sea-Floor Spreading?
300
What boundary does this diagram represent?
Transform
300
What is created when two plates slide past each other?
earthquakes
300
When continental and oceanic crusts converge what forms at the place where the plates collide?
A subduction zone - it is a deep ocean trench
300
What is a real world example of a feature that a divergent plate boundary created?
Great Rift Valley; Mid-Atlantic Ridge
300
How many seismograph readings does it take to find the focus of an earthquake?
3 - it's called triangulation
400
What scientist developed 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
Why is there no subduction zone when two continental plate converge?
Continental plates are NOT dense enough to sink into the mantle (they are too light)
400
What is a real world example of a feature that a transform plate boundary created?
San Andreas Fault
400
What is an example of a continental hot spot?
Yellowstone
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?
volcanic mountain ranges
500
How were the Appalachian Mountains formed?
Africa and North American plates converged (c:c convergence)
500
What is a subduction Zone?
the oceanic crust usually sinks into the mantle beneath lighter continental crust.
500
What is an example of an oceanic hot spot?
The Hawaiian Islands