地質學上來說,(trough)是指線狀結構性下沈,並向槓伸延至一定距離,而比溝(trench)更平坦。槽可以是狹窄的盆地或是地質上的裂縫(rift)。世上有很多槽出現在海中的例子,稱為海槽,如在中洋脊(mid-oceanic ridge)附近的裂縫及日本海溝

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