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How Trenches Form. Trenches are formed by subduction, a geophysical process in which two or more of earth's tectonic plates.
Trenches are formed by subduction, a geophysical process in which two or more of earth's tectonic plates.
Trenches are formed by subduction, a geophysical process in which two or more of earth's tectonic plates. Trenches are formed by subduction, a geophysical process in which two or more of earth's tectonic plates.