Download Plates Move

Plates Move
Plates move
 Plates are what move
 They move what is on top of them
 Crust is on top of the plates
 Continental Crust- The crust that makes up
continents/land
 Oceanic Crust- The crust that makes up the oceans
Divergent Boundary
 Plates move apart
 Most are found in the ocean
 Mid-ocean ridges are found where this happens
 In the ocean they move apart and riff valleys
form
 This is how continents split apart
 New crust is formed
Process
 1. Hot material rises from the mantle
 2. The heat causes the crust to bulge upward
 3. The crust cracks, and a riff valley is formed
 4. Magma rises, the continent splits apart
Transform Boundaries
 Plates move past each other in opposite
directions
 Crust is not formed or destroyed
 Occur mostly at the sea floor but can form on
land too
 San Andreas Fault
Convergent Boundary
 Plates push together
 3 different types
 Continental-continental collision
 Oceanic-oceanic collision
 Oceanic- continental collision
 Crust is destroyed or folded
Continental- Continental
Collisions
 Two continental plates collide
 Each plate is the same density
 No plates can sink, so it has to collide
 Mountains are made when the two plates run
into one another
 EX: Rocky Mts.
Oceanic- Continental
Collision
 A piece of oceanic crust runs into a piece of
continental crust
 Oceanic crust sinks
 Deep-ocean trenches
 Costal mountains
 EX: Andes Mts.
Oceanic-Oceanic Collision
 2 plates run into one another
 The older plate will sink under the newer plate
 Subduction- When one plate sinks beneath another
 The plate moves into earth, and melts
 Forms
 Deep ocean trenches- deep canyons on the ocean
floor
 Island arcs- volcanic islands
 EX: Hawaii
Hot Spot
 Heated rock rise in plumes, are thin columns from
the mantle
 The magma eventually hardens
 The magma could have risen so high that it
peaks out of the water
 More islands will form in an arc, this shows how
the plate is moving
 EX: Hawaii
Review
 In what direction do plates move in convergent
boundaries?
 A. Towards each other
 B. Away from each other
 C. Depends on stress
 D. Past each other
Review
 In what direction do plates move in transform
boundaries
 A. Towards each other
 B. Away from each other
 C. Depends on stress
 D. Past each other
Review
 In what direction do plates move in divergent
boundaries
 A. Towards each other
 B. Away from each other
 C. Depends on stress
 D. Past each other
Review
 What feature occurs at a divergent boundry
 A. Island arc
 B. Riff valley
 C. Mountains
 D. surface fault
Review
 The Andes Mountains in South America occur at
what type of boundary?
 A. Continent-continent convergent boundary
 B. Continent-oceanic convergent boundary
 C. Divergent boundary
 D. Transform boundary