Official 16 Lec 1
Question 4 of 6
What does the presence of gypsum in Lechuguilla Cave indicate?

A.

The cave was not formed by flowing water

B.

The cave is no longer forming

C.

Bacteria are present in high concentrations inside the cave

D.

No type of acid was involved in the formation of the cave

正确答案:A

显示答案
进入答题
00:00
00:00
隐藏原文

译文

精听文本