Plate Movements
When two plates collide
convergent
What scientist is responsible for the Continental Drift Theory?
Alfred Wegner
The engine that moves the plates
convection currents
New crust is created in which type of plate boundary?
Divergent
The result of two continental crusts colliding into each other
mountains
When two plates move away from each other
divergent
What scientist is responsible for explaining HOW the plates moved?
Harry Hess
The thin layer of rock that underlies the ocean basins
oceanic crust
True or false: Water will eventually fill rift valleys created by divergent plate boundaries
true
What type of crust is destroyed in subduction?
old
transform
This scientist measured magma rising up on the sea floor while he sailed with the Navy
Harry Hess
The layer of rock that forms the continents
continental crust
The result of plates slipping past each other
earthquakes
What forms when continental and oceanic plates go through subduction?
volcanoes
When one plate slides underneath another plate
subduction
How many years passed before Wegner's theory of Continental Drift was accepted after his death?
30
The upper mantle
asthenosphere
What is the process of two plates oceanic crusts diverging and creating a mid-ocean ridge?
sea-floor spreading
The reason behind one plate sliding underneath another in subduction
plate density
How do large plates move across Earth's surface?
convection currents
What was Harry Hess' theory called?
Sea Floor Spreading
The outer crust
lithosphere
The name of the most famous transformation plate boundary
San Andres Fault
One of the most geologically active areas on Earth
Ring of Fire