active margin

American  

noun

1. Geology. Also called convergent plate boundary. the boundary between two tectonic plates that are approaching each other.

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active margin Scientific  

1. See convergent plate boundary

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Example Sentences

Because the edge of the North American continent is colder than a plate near an active margin, Levin suspects this edge is cooling the mantle—the layer just below the crust that extends toward the earth's core.

From Scientific American