Imagine that Eridians grow with age, so when Rocky first left Erid, Adrian was around the same size as them, but now coming back all these years later Rocky reunites with Adrian and they're now like three times the size of Rocky. (the wonders of time dilation)
Rock doing the equivalent of blushing furiously and swooning like "omg... my mate is so so so beautiful."
Also imagine that they never stop growing until death, so maybe by the time they reach 600-and-something and die of old age, they're MASSIVE.
So an old Eridian will just lumber off a ways, sit down, and pass on. and boom. they're a mountain now. That's a mountain.
Rocky leads Grace to two towering mountains and points up at them like "look look look! These were Rocky's parents!"
(yes, I was thinking about lobsters when I wrote this)














