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1·Submarine canyon is a geological structure that formed by plate movement in the crust.

海底峡谷，是由于地壳板块运动而形成的一种地质构造。

2·And they couldn't be more perfectly placed because just off shore lies a vast submarine canyon.

这里的位置是最理想的，因为海岸边的水下就是大片的峡谷。

3·Upward-fining channels may occur in a wide range of environments from submarine canyon to alluvial fan.

向上变细的水道可以出现在好多种环境中，从海底峡谷到冲积扇。