This verse has also been previously discussed in other posts, such as this, but in the linked post, the answer receiving the most up-votes, that of Medi1saif's, unfortunately didn't answer the question concretely.
Because, there, in the 2nd scenario of the answer receiving the most upvotes, it was mentioned that if all of the mountains were magically removed, there would be immediate repercussions and there would be world-wide earthquakes. This might convince you into quenching your doubt about 31:10.
But this is not what 31:10 is talking about. The verse is saying that mountains add stability to the ground, otherwise, the earth would shake with us, implying that the earth would have been moving due to OUR movement, which is unscientific.
So what is a concrete conclusion of the verse 31:10?
N.B: (Medi1saif, if you're reading this, what is your take on 31:10 now i.e.after reading the answer on Worldbuilding SE?)
If there's any probem in my question please inform me. Thanks!