What is the relationship of the dense oceanic crust that is produced at a divergent plate boundary to the convergence or collision of an oceanic plate and a continental plate,such as the western margin of South America in the diagram below? 
Definitions:
Limbic System
A complex system of nerves and networks in the brain, involving several areas near the edge of the cortex concerned with instinct and mood. It controls the basic emotions (fear, pleasure, anger) and drives (hunger, sex, dominance, care of offspring).
Forebrain
The anterior part of the brain, including the cerebrum and structures related to it, responsible for complex cognitive, sensory, and motor functions.
Cerebral Cortex
The outermost layer of the brain, involved in high-level functions such as sensory perception, cognition, and motor control.
Occipital Lobe
The portion of the cerebral cortex located at the back of the brain, responsible for processing visual information.
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