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:
Genetic
Relating to genes or heredity, encompassing the study of how traits and characteristics are transmitted from parents to offspring.
Down Syndrome
A genetic disorder caused by the presence of all or part of a third copy of chromosome 21, resulting in a distinctive set of physical and intellectual traits.
Extra Chromosome
A genetic condition where an individual has more than the usual number of chromosomes, leading to developmental differences and physical anomalies.
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