Plate Boundaries Flashcards
What is a scarp?
An inward facing wall on oceanic ridge valleys
Give an example of an ocean volcano
Surtsey, Iceland
What is a transform fault?
A crack that has been created in the newly created oceanic mountain ridges
What is a Rift Valley?
Sudden dips in the land height at divergent boundaries, that are crated as the continental crust breaks and fractures
Name and ocean trench that is a product of oceanic/continental convergence?
Peru-Chile trench
What is the continental shelf?
The edge of the continental plate
What accumulates upon continental shelves and what does this eventually help to form?
Sediment - fold mountains
What is an island arc and give an example?
A chain of island volcanoes that form under an oceanic plate as magma plutons rise and breach the crust. e.g Marina islands
What is the Benioff zone
The location in the asthenosphere that melts oceanic crust
Give an example of fold mountains
Himalayas
What is an oceanic ridge and where do they form?
A mountain range under the ocean which form at divergent plate boundaries
Explain a divergent plate boundary?
Convection currents take two plates away from each other allowing the underlying magma to rise to the opened surface where it solidifies quickly to then block the newly opened vent. However the convection currents persist and so eventually tear this new crust into two new parts of the plates that existed before going in different directions
What can be formed at an oceanic/continental convergent plate boundary?
Ocean trench, fold mountains, volcanoes, earthquakes
What can be created at an oceanic/oceanic convergent plate boundary?
Mountains/Volcanoes (Island Arc) & Ocean trench
Give an example of an ocean trench created by oceanic/oceanic convergence plate boundary?
Marina Trench
