Contiental Drift
This is the name of the proposed "supercontinent" where all the earth's continents were once joined together.
Pangaea
Seafloor Spreading occurs at what type of plate boundary?
divergent boundary
This is the underlaying (plastic-rock) flowing layer which allows the earth's plates to move.
Asthenosphere
This type of plate boundary involves two plates moving apart from one another.
divergent boundary
These features are produced on earth when two continents collide.
mountains
This is the meteorologist who first proposed the Theory of Continental Drift
Alfred Wegener
These features form as new crust rises to the surface during seafloor spreading
mid-ocean ridges
This is the rigid upper layer of the earth which inlcudes the earth's crust and upper most mantle.
lithosphere
This type of plate boundary involves two plates moving toward each other.
convergent boundary
These features are produced on the coasts of continents where oceanic crust moves underneath the continent.
volcanoes
This is how many years ago earth's "supercontinent" began to split apart.
200-250 million years ago
This ocean is currently growing in size due to seafloor spreading.
Atlantic Ocean
This is the total number of plates known on earth.
30
This type of plate boundary involves one plate sliding past another plate.
transform boundary
These natural disasters occur when a sudden movement occurs along transform boundaries.
earthquakes
These are the two types of evidence that were initially used to support the Theory of Continental Drift.
similar shapes of coastlines and fossil evidence
This was the first evidence to support the idea of the reversal of earth's magnetic field.
matching strips of polarity on each side of a seafloor spreading region
This is the average distance the earth's plates move per year.
1 inch / year OR 2 cm / year
This is the term for one plate being forced underneath another plate.
Subduction
This is the name of fault found in California where several major earthquakes have occured.
San Andreas Fault
This is the name of the "superocean" when all the earth's oceans were combined together
Panthelassa
This is how many years ago the earth's magnetic poles switched.
1 million years ago
These are the two types of crust found on earth and their densities and thicknesses?
continental crust (less dense, but thicker) and oceanic crust (more dense, but thinner)?
This is the term for the fracture created when one plate suddenly slides past another plate.
fault
These two features form in the ocean when one oceanic plate is forced below another oceanic plate
trenches and volcanic islands