I was reading an answer from Chegg solution for the following question : describ

Question

I was reading an answer from Chegg solution for the following question : describe the process that leads to the formation of deep ocean trenches. and the answer is in the pic below but I don't I don't understand the part where it says "mantle is descending into the mantle"

me , 11 21 %D 1:16PM Earth Ch 2.4 4 2.5 2.6 2.7 2.8 Chapter 2.6 Problem 3CC Step 1 0 13356-7.6-3CC AID: 1326 | 08/12/2014 Old oceanic lithospheres which are denser descend into the mantle. When the lithosphere descends into the mantle, it manifests on the oceanic sea floor as deep ocean trenches. Deep ocean trenches occur at sites where the mantle is descending into the mantle. Ocean trenches are long, deep and linear. Chegg

Explanation / Answer

I think the mantle word is repeated two times.

May be it is ocean floor sinking into the mantle.

In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.

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