Plate Margins (AQA A-Level Geography): Flashcards
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3 types of plate margins by movement
3 types of plate margins by movement
Constructive (divergent), destructive (convergent), conservative
What forms at constructive plate margins?
What forms at constructive plate margins?
New lithosphere in the gap between separating plates
Length of ocean ridge system globally
Length of ocean ridge system globally
Nearly 65,000 kilometres
Great Rift Valley width & depth
Great Rift Valley width & depth
Up to 120 km wide and 1,500 m deep
Definition of subduction
Definition of subduction
Denser oceanic crust forced beneath lighter continental crust
Depth of Challenger Deep (Marianas Trench)
Depth of Challenger Deep (Marianas Trench)
Just over 10,900 metres (deepest part of world's oceans)
How the Himalayas formed
How the Himalayas formed
Indo-Australian plate pushed into Eurasian plate (collision)
Volcanic activity at conservative margins?
Volcanic activity at conservative margins?
No volcanic activity (no subduction occurs)
Example of conservative plate margin
Example of conservative plate margin
San Andreas Fault in California
Hawaiian island chain: length & age
Hawaiian island chain: length & age
6,000 km long, active for ~70 million years