What is the process that leads to the movement of plates?
Convectional currects
200
what is the feature found at the subduction zone and state and example
Oceanic trench; mariana trench between Philippine and Pacific plate
200
What is the process called when 2 oceanic plates diverge?
Sea floor spreading
200
What happens when plates slide past each other?
tremendous stress is built up and when released, it causes earthquakes.
300
this is the layer that has the crust floating on the upper mantle.
Lithosphere
300
State one difference between an oceanic and continental crust
Oceanic crust is thicker
Oceanic is heavier and denser
300
What happens when the Indian plate collided with the Eurasian Plate?
Folding leading to mountain range.
300
What is Azores and explain how it was formed.
Chain of volcanic islands in the North Atlantic sea, as a result of the divergence of the north american plate and eurasian plate. Magma rises at the zone of divergence to form volcanoes.
300
Name the landforms that can be found at transform boundaries.
NONE
400
In which layer does melting begin?
asthenosphere
400
How much do plates move a year on the average?
a few cm
400
Explain how the Sunda trench was formed.
when an oceanic plate (Australian) converge with a continental plate(Eurasian), the denser oceanic plate subducts, forming a deep depression
400
What are the features found when 2 continents diverge?
volcanoes, rift valleys and block mountains
400
Earthquakes in Turkey are a result of ______________ plate sliding past ________ plate
Anattolian; Eurasian
500
How thick is the outer core?
2100 km
500
What can happen within plates (not at plate boundary)?
Break up leading to deformation and fractures, for eg at African Plate
500
Can fold mountain become volcanoes? EYA.
Yes. When cracks are formed, magma rises through these cracks to form volcanoes.
500
Rift valleys are found at the divergent plate boundaries between 2 plates. Is this always true? EYA.
No. It can happen within a plate. For eg, the East African Rift Valley was a result of the African plate being stretched causing large fractures in the crust.
500
How much did the N American Plate move during the earthquake in 1906?