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زمینشناسی و معدن::
دشت مغاکی
The result is an elongated deep trench that is located between the abyssal plains and the border of the upper plate.
The subducting oceanic plate carries sediments on its surface (pelagic sediments from the abyssal plain; pelagos, Greek sea, ocean) and this material can be carried tectonically into trenches.
If trench fill is rapid under these conditions, the trench fills and trench morphology is f lat and the surface grades into the adjacent abyssal plains.
Accordingly, the sediments formed on the abyssal plains are thicker here than
The depth of the trench with respect to the adjacent abyssal plain reflects the different sedimentation regimes of these three areas: The Kurile-Kamchatka Trench is approximately 3-4 km deeper; the Alëutian Trench is 1-2 km deeper, and the Washington-Oregon Trench does not show notable trench morphology or difference in depth.
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