plate tectonics
TRANSCRIPT
Tension DIVIDING
Plates are moving apart.
Crust gets thin and stretched.
Rift Valley on Land
Mid Ocean Ridge under water where sea floor spreading is occurring.
Rift Valley - Iceland- East African
Mid Ocean Ridge- Mid
Atlantic Ridge
Normal Fault- Hanging
wall sinks
Shearing SLIDE
Plates are sliding or slipping horizontally past each other.
Create fracture zoneconnecting 2 sections of mid ocean ridge.
Create fault lines with out loss of rock
Fracture Zone- Mid Ocean
Ridge
Transform Fault- San Andreas
Fault (CA)- Alpine Fault
of New Zealand
Strike-Slip Fault- Plates
grind and slide past each other
Co
nve
rgen
t
Compression Continent to Continent
Collide
Plates move toward each other.
Squeeze and push against each other, shortening a body of rock.
Create Large mountain ranges.
Mountain Ranges- Appalachian
Mountains- British Isles
- Himalayas
Reverse Fault- The hanging
wall moves up relative to the footwall.
Co
nve
rgen
t
Ocean-Ocean
As the crust collide, the denser crust subducts or sinks below the other oceanic crust, falling back into the mantle.
Oceanic trenches are created where subduction occurs.
Volcanic Island Arcs are created as plates collide.
Ocean Trenches- Mariana
Trench- Japan Trench
Volcanic Island Arc- Japan- New Zealand- Caribbean
Islands
Reverse Fault- The hanging
wall moves up relative to the footwall.
SUB
DU
CTI
ON
Ocean-Ocean Ocean-Ocean Ocean-Ocean
The denser oceanic crust collides with less dense oceanic crust.
Co
nve
rgen
t
Ocean-Continent
As the crust collide, the denser ocean crust sinks below the continental crust, falling back into the mantle.
Oceanic trenches are created where subduction occurs.
Volcanic Mountain Ranges on Continents.
Ocean Trenches- Peru-Chile
Trench
Volcanic Mountains- Andes
Mountains- Cascade
Volcanic Chain
Reverse Fault- The hanging
wall moves up relative to the footwall.
SUB
DU
CTI
ON
The denser oceanic crust collides with less dense continental crust.
Ocean-Continent Ocean-Continent Ocean-Continent
