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زمینشناسی و معدن::
درازگودال دریای عمیق
only represented by a line at the surface, commonly within a deep sea trench, a zone several hundreds of kilometers wide is formed by processes which are related to subduction.
Differences in altitude of 10 km between the deep sea trench and volcanoes of the magmatic arc are not unusual.
The landward side of the deep sea trench is part of the upper plate and consists of
Collectively, the deep sea trench, outer ridge, and forearc basin comprise the forearc region.
On the other hand, the depth of the deep sea trenches is significantly deeper on average because the sub- ducting plate bends downward very steeply and the island arcs do not deliver enough sedimentary material to even partially fill the trench.
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