Boundaries
What are divergent boundaries?
Plates that move apart forming a rift valley.
How is the deep ocean trench created?
by subduction
Oceanic crust vs Continental crust
Dense, ocean floor crust pushes down into mantle re-melting crust.
What is subduction?
The edge of one plate goes under another.
What are transform boundaries?
Plates that slide-slip past each other.
How is the mid-ocean ridge created?
When plates move apart at a divergent boundary.
Oceanic crust vs Oceanic crust
Older, denser crust is pushed down under the younger.
What is magma?
Magma is lava that is inside a volcano.
What are convergent boundaries?
Plates that collide or smash together.
How are volcanos created?
floor crust pushes down into the mantle re-melting crust.
Continental crust vs Continental crust
No subduction of plates; collision causes crust to crumple up to form mountains
What is seafloor spreading?
new oceanic crust is formed through volcanic activity
Name the three types of convergent boundaries.
Ocean crust vs continental crust
Oceanic crust vs oceanic crust
Continental crust vs continental crust
How are mountains created?
plates collide and smash into each other.
What formations can these create?
Deep trenches, mountains, and volcanos
What is an earthquake prone area?
San Andreas fault
What are oceanic and continental?
The two types of divergent plate boundaries
How are rift valleys created?
They pull apart from the lithosphere.
What are examples of crusts?
What are examples of crusts? Examples include Tonga trench, Philippine Island, Himalayan mountains, Alps, Mount Saint Helen and Mount Lascar
How is new crust formed?
At mid-ocean ridges, plates move apart, and new magma erupts the cools to form new crust.