I think I've counted just about everything in the BoS and looking at some notes today, I noticed that the number of letters in each line of the crevasse spell can be converted (1=A,2=B etc) and rearranged to the letters M-O-O-N

Ground will shake = 15 letters = O
And none can pass = 14 letters = N
This spell to make = 15 letters = O
A deep crevasse = 13 letters = M

This is probably meaningless, but then again .......