Plates
When two plates move away from each other in opposite directions
What is a divergent boundary
When rock is stretched thin and long.
What is tension stress?
The point where an earthquake actually happens.
What is the focus?
The type of crust that does not contain large amounts of water.
What is continental crust?
The scientist that first came up with a theory of continents drifting apart.
Who was Alfred Wagner?
When two plates move towards each other.
What is a convergent boundary
When rock is squeezed and thickened.
What is compression stress?
The point on the surface directly above the spot an earthquake happens.
What is the epicenter?
The type of crust that is always under water.
What is oceanic crust?
Evidence where coast line of west Africa matches up with coast line of eastern South America.
When two plates slide past each other horizontally.
What is a transform boundary?
When plates slide past one another.
What is shearing stress?
Vibrations that travel in all directions away from an earthquake.
What are seismic waves?
When liquid rock is underground in the crust.
What is magma
Evidence where fossils like the fern Glossopterus is found in Africa and in Antartica.
What is evidence from fossils?
When one plate slides underneath of another plate.
What is subduction?
When rock on the crust is pushed upward into mountains.
What is an anticline?
The fastest of the seismic waves.
What are P or Primary waves?
When liquid rock is above ground.
What is lava?
The name of the giant land mass that Alfred Wagner used in his theory of continental drift.
What is Pangaea?
The plate that we live on.
What is the North American Plate?
When rock sinks downward into a valley.
What is a syncline?
What are S or secondary waves?
The area around the edge of the pacific ocean known for lots of earthquakes and volcanoes.
What is the Ring of Fire?
Land feature that lead scientist to not accept Alfred Wagners hypothesis.
What is mid-ocean ridge?