The Origin of Submarine Canyons Is Not Well Understood, but Most

The origin of submarine canyons is not well understood, but most likely

A) is erosional, started by streams during periods when the sea level was lower.
B) is tectonic, and represents down-folds of rock within the continental shelf.
C) is organic, resulting from the activities of burrowing organisms.
D) is glacial, the work of glaciers depositing rock debris on the shelf.

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