Contiental Drift
Seafloor Spreading
Earth's Plates
Plate Boundaries
Effects of Plate Tectonics
100

This is the name of the proposed "supercontinent" where all the earth's continents were once joined together.

 Pangaea

100
Seafloor Spreading occurs at what type of plate boundary?
What is a divergent boundary?
100
This is the underlaying (plastic-rock) flowing layer which allows the earth's plates to move.
What is the Asthenosphere?
100
This type of plate boundary involves two plates moving apart from one another.
What is a divergent boundary?
100
These features are produced on earth when two continents collide.
What are mountains?
200
This is the meteorologist who first proposed the Theory of Continental Drift
Who is Alfred Wegener?
200
These features form as new crust rises to the surface during seafloor spreading
What are mid-ocean ridges?
200
This is the rigid upper layer of the earth which inlcudes the earth's crust and upper most mantle.
What is the lithosphere?
200
This type of plate boundary involves two plates moving toward each other.
What is a convergent boundary?
200
These features are produced on the coasts of continents where oceanic crust moves underneath the continent.
What are volcanoes or volcanic arcs?
300
This is how many years ago earth's "supercontinent" began to split apart.
What is 200-250 million years ago?
300
This ocean is currently growing in size due to seafloor spreading.
What is the Atlantic Ocean?
300
This is the total number of plates known on earth.
What is 30?
300
This type of plate boundary involves one plate sliding past another plate.
What is a transform boundary?
300
These natural disasters occur when a sudden movement occurs along transform boundaries.
What are earthquakes?
400
These are the two types of evidence that were initially used to support the Theory of Continental Drift.
What are similar shapes of coastlines and fossil evidence?
400
This was the first evidence to support the idea of the reversal of earth's magnetic field.
What is matching strips of polarity on each side of a seafloor spreading region?
400
This is the average distance the earth's plates move per year.
What is 1 inch / year?
400
This is the term for one plate being forced underneath another plate.
What is Subduction?
400
This is the name of fault found in California where several major earthquakes have occured.
What is the San Andreas Fault?
500
This is the name of the "superocean" when all the earth's oceans were combined together
What is Panthelassa?
500
This is how many years ago the earth's magnetic poles switched.
What is 1 million years ago?
500
These are the two types of crust found on earth and their densities and thicknesses?
What is continental crust (less dense, but thicker) and oceanic crust (more dense, but thinner)?
500
This is the term for the fracture created when one plate suddenly slides past another plate.
What is a fault?
500
These two features form in the ocean when one oceanic plate is forced below another oceanic plate
What are trenches and volcanic islands?
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