Scientific investigations prove that the mountains here are of a limestone composition, and that the Yellow Dragon is actually a geological formation unique to a karst region.

据科学工作者考察，这里的山体系石灰岩地质，黄龙景观实为岩溶地貌。

Going further into what causes them, one recent study looking at a karst region in Spain found that sinkhole activity is intensified during drought periods.

进一步研究导致它们的原因， 最近一项针对西班牙喀斯特地区的研究发现，天坑活动在干旱时期加剧。