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Biology 8 Online
OpenStudy (anonymous):

An ocean trench: marks the upwelling of mantle material is the site of submarine volcanoes occurs where a plate is moving down started the breakup of the single southern continent

OpenStudy (anonymous):

The ocean trench marks the upwelling of the mantle material. the ocean trenches are the cause of sea-floor spreading. This might help you understand. https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcQvDTjIVAPiVA7DrpZ2keu2jN9rDvb_r6BZ39jeB4yjoJlMq42u

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