Where does a Deep-Ocean Trench occur?
A convergent plate boundary where one continental plate and one oceanic plate collide.
What happens at a Deep-Ocean Trench?
Old Ocean Floor sinks toward the mantle
Where does a Mid-Ocean Ridge occur?
A divergent plate boundary; 2 oceanic plates move away from each other
What happens at a Mid-Ocean Ridge?
Sea-Floor Spreading occurs
What contributions did Alfred Wegner have on earth's geology?
He started the theory of sea-floor spreading
What contributions did Harry Hess have on earth's geology?
He discovered mid-ocean ridges and deep-ocean trenches
What 3 types of evidence did Harry Hess have to support Sea-Floor Spreading?
Molten Material, Magnetic Stripes, Drilling Samples
Example of molten material that Harry Hess had...
Pillow shaped rock, magma when it cools quickly
Example of Drilling Samples that Harry Hess had...
Closer to mid-ocean ridge is newer, farther from mid-ocean ridge is older
Type of plate movement at divergent plate boundaries.
away from each other
Type of plate movement at convergent plate boundaries.
toward each other, with oceanic - continental oceanic sinks below continental
Type of plate movement at transform plate boundaries.
slide past each other in opposite directions
Landforms along divergent plate boundaries (continental-continental)
Mid-Ocean Ridges, Rift Valley
Landforms along divergent plate boundaries (oceanic- oceanic)
Mid-Ocean Ridges
Landforms along convergent boundaries (continental-continental)
Mountain ranges, volcanoes
Landforms along convergent boundaries (continental-oceanic)
deep-ocean trenches
Landforms along transform boundaries
earthquakes, faults
How do volcanoes form?
When there is a weak spot in the earth's crust and magma rises to the surface
Difference between magma and lava
lava is magma that rises to the surface of the earth
What is the Ring of Fire?
a major belt of volcanoes that surrounds the pacific ocean
Where is the Ring of Fire, locate it?
around the pacific ocean
How is a hot spot volcano formed?
When magma erupts through the crust and reaches the surface