Vocabulary
The number of layers of the Earth.
What is four
The hypothesis that the ocean floor is not permanent but is constantly renewed.
What is seafloor spreading?
Location where two sections of lithosphere meet.
What is a plate boundary
The thickest layer of the Earth where convection drives plate movement.
What is the mantle.
The discovery of the same extinct species on different continents supported continental drift through this type of evidence.
What is fossil evidence?
Location of new rock formation as oceanic plates move apart and magma rises to the surface.
What is mid-ocean ridge?
Boundary where plates move toward each other.
What is convergent?
Plates float on top of this plastic layer.
What is the asthenosphere?
Feature found at the site of lithosphere destruction.
What is oceanic trench?
A boundary where plates move horizontally relative to each other.
What is transform?
States that youngest rocks of ocean floor are at diverging boundaries, moving outward
What is seafloor spreading
A supercontinent that existed many millions of years ago.
What is Pangaea?
This person used sonar to map the bottom of the ocean and discovered the mid-ocean ridge in the Atlantic Ocean.
Who is Harry Hess!
A boundary where tectonic plates move away from each other.
What is divergent?
The part of the crust that is thinner and more dense.
What is oceanic crust?
Continental Drift Theory was not accepted because it did not explain this
What is how the continents moved
A zone where oceanic crust goes under the less dense continental crust creating a trench.
What is subduction?
A current that cycles due to differences in temperature causing material to rise and fall.
What is convection current?