Definition: Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.
Input: original question: Which geographical feature category has the subcategories of [Submarine canyon]?
answer: undersea
answer type: Geographical feature category.
auxiliary information: A submarine canyon is a steep-sided valley cut into the sea floor of the continental slope, sometimes extending well onto the continental shelf and having relief comparable to even the largest of land canyons. About 3% of submarine canyons are joined to shelf valleys that connect with large rivers; the largest canyons incise into the continental shelf but the largest number of canyons terminate on the slope, making so-called ‚Äúblind‚Äù or ‚Äúheadless‚Äù canyons. Canyons cutting the continental slopes have been found at depths greater than 2 km below sea level. Many submarine canyons continue as submarine channels across continental rise areas and may extend seawards for hundreds of kilometres onto the abyssal plain. Ancient examples have been found in rocks dating back to the Neoproterozoic. Turbidites are formed in submarine canyons.

What category of geographical feature is [Submarine canyon] a subcategory of?