Locations
The youngest rocks on the ocean floor are located here.
What are mid-ocean ridges.
This man came up with the theory that continents are moving.
Who is Alfred Wegener?
This super continent existed around 250 million years ago.
What is Pangea?
These underwater mountain ranges were discovered by Harry Hess.
What are mid-ocean ranges?
This boundary occurs when two plates are moving toward one another.
What are convergent boundaries?
Plates of the lithosphere float atop this.
What is the asthenosphere?
The theory that the continents have slowly moved to their current location.
What is continental drift theory?
This man is known as the "King of all Science Teachers."
Who is Mr. Swann?
This occurs when a slab sinks and pulls the rest of the plate with it.
What is slab-pull ?
This boundary occurs when two plates are moving away from one another.
What are divergent boundaries?
These mountains are an example of convergent boundaries.
What are the Himalaya mountains?
This theory states that Earth's surface is made up of rigid slabs or rock that move with respect to one another.
What is the theory of plate tectonics?
These four pieces of evidence helped Wegener come up with his hypothesis.
What are fossil, rocks, climate evidence and how the continents seem to fit together?
These currents explain sea-floor spreading and the movement of the continents.
What are convection currents? (these currents move molten material upward to Earth's surface)
This boundary occurs when plates slide past one another.
What are transform boundaries?
These valley's are produced by continental-continental plate collisions.
What are rift-valleys?
This man provided evidence (that Wegener did not have) to convince people why the continents are in motion.
Who is Harry Hess?
This fossil fern helped support Wegener's hypothesis of continental drift.
What is the Glossopteris?
This occurs when plates move away from a ridge.
What is ridge push?
In sea-floor spreading, the seafloor cools and becomes more or less dense than the material beneath it.
What is more?
Active volcanoes are most likely to form at this type of boundary.
What are convergent-oceanic-continental boundaries?
This discovery explains how the continents move.
What is sea-floor spreading?
This is made up of the crust and upper mantle.
What is the lithosphere?
This occurs when one plate goes under another plate when two plate boundaries collide.
What is subduction?
This is the circulation of material caused by differences in density.
What is convection?