1st Quarter Sci (Plate Boundaries) Flashcards
Active regions in Earth
Plate Boundary
3 Types of Plate Boundaries
Divergent, Convergent, and Transform Fault
Where two plates move apart from each other.
Divergent Boundaries
New crust is created at the boundary as two lithospheric moves away from each other.
Divergent Boundaries
Known as Constructive plate margins.
Divergent Boundaries
Formation of Divergent Boundaries
Rift Valley and Mid ocean Ridges
Rising magma from the Earth’s mantle to fill the gap (ocean floor).
Seafloor Spreading
Formation when in the land
Rift Valley
Examples of Mountyain chain (any)
East Pacific- Pacific and Cocos Plates
East Pacific - Nazca and Antarctic Plates
Galapagos- Pacific and Juan de Fuca Plates
Nazca, Cocos, and Pacific (triple junction)
When two plates move toward each other.
Convergent Boundaries
Where crust is Destroyed as one plate dives under another.
Convergent Boundaries
Called as Destructive plate margins or subduction
Convergent Boundaries
When one tectonic plate slides beneath another.
Subduction
3 Types of Convergent Boundaries
Oceanic-Continental, Oceanic-Oceanic, and Continental-Continental
Formation Convergent Boundaries
Volcanic Island, Deep sea Trenches, Volcanic Mountains
Example of Oceanic-Continental
Juan de Fuca and North American Plate (Cascade Range)
Philippine and Eurasian Plate (Japan Alps)
explain Oceanic-Continental
Oceanic always subduct under continental.
Oceanic is denser so the oceanic will dive .
Oceanic colliding continental crust .
explain Oceanic-Oceanic
When two oceanic plates collide Older crust will dive into younger oceanic.
Formation Oceanic-Oceanic
Trench, Island Arc, and Chain of Volcanic Island
Example of Oceanic-Oceanic
Eurasian and Philippine will form Philippine trench
explain Continental-Continental
When two continents meet head on No subduction because both of them are less dense repetition
It forms mountains
Example Continental-Continental
Eurasian Plate and Indian Plate (Himalayas)
Sliding along with each other
Transform Fault
Called conservative plate
Transform Fault
When they occur on the seafloor, they form
Oceanic Fracture zones
Formation Transform Fault
Major Earthquakes
