Theory of CD
This is the name of the proposed "supercontinent" where all the earth's continents were once joined together.
What is Pangaea?
Seafloor spreading occurs at what type of plate boundary?
What is a divergent boundary?
This is the underlaying flowing layer which allows the earth's plates to move.
What is the Asthenosphere?
This type of plate boundary involves two plates moving apart from one another.
What is a divergent boundary?
These features are produced on earth when two continents collide
What are mountains?
This is the meteorologist who first proposed the Theory of Continental Drift.
Who is Alfred Wegener?
These features form as new crust rises to the surface during seafloor spreading
What are mid-ocean ridges?
This is the rigid upper layer of the earth which includes the earth's crust and upper mantle.
What is the lithosphere?
This type of plate boundary involves two plates moving toward each other.
What is a convergent boundary?
These features are produced on the coasts of continents where oceanic crust moves underneath the continent.
What are volcanoes?
This is how many years ago earth's "supercontinent" began to split apart.
What is 250-300 million years ago?
This ocean is currently growing in size due to seafloor spreading
What is the Atlantic Ocean?
These are the two types of crust found on earth.
What is continental and oceanic crust?
This type of plate boundary involves one plate sliding past another plate
What is a transform boundary?
What are earthquakes?
This is why others did not believe the continental drift theory.
This is a long narrow deep depression in the ocean floor, typically one running parallel to a plate boundary and marking a subduction zone.
What is an ocean trench?
This is the average distance the earth's plate move per year.
2.5 cm
This is the term for one plate being forced underneath another plate.
What is subduction?
This is the name of fault found in California where several major earthquakes have occured.
What is the San Andreas Fault?
These are the three types of evidence that were initially used to support the Theory of Continental Drift.
What are fossils, climate, and landforms?
This is how many years ago the earth's magnetic poles switched
What is 1 million years ago?
This is the total number of plates known on earth.
What is 30?
This is the term for the fracture created when one plate suddenly slides past another plate.
What is a fault?
These two features form in the ocean when one oceanic plate is forced below another oceanic plate.
What are the trenches and volcanic islands?