Bbbbbbanshhaa wow kiwi askksks h a
its an opening from a persons lip, most time its extended to the nose
It’s A because i just got off of it
The main idea of this paragraph is that the rocks cannot be explained by science, that there is a mystery to them. This sentence contributes to that idea because it gives a specific example of one of the odd things about the rocks. Because they are on a flat surface they should not roll or move on their own, but the fact that they have a trail behind them shows that they have somehow moved. This supporting statement is then supported by more details about the trails.
