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A trench is an arc-shaped depression in the deep-ocean floor. The crease occurs in the seafloor when a converging oceanic plate is subducted. It is considered to be the deepest place in the Earth's crust.

A submarine canyon cuts into the continetial shelf and slope, ending in a deep sea fan. Sometimes they extend from the mouth of a river that drains sediment and fast flowing water out to sea. It is created by erosion like canyons on land, also they are sometimes created by earthquakes that cause an "avalanche" of sediments.

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Q: What are the differences between a submarine canyon and a deep-ocean trench?
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