SC Archive | Re: Help regarding pronoun/antecedent mapping!!

Q: The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, is known as "standing waves."

Hi,

In the above OG problem, require help in accessing the antecedent for which the pronoun "them" in the second clause refers to?

Thanks.

Regards,
Pulkit