[FW.02]The pictures below show four Earth features.
Which of these features are formed by underground reactions between acid in groundwater and limestone?
A) 1 and 2
B) 2 and 3
C) 3 and 4
D) 1 and 4
![[FW.02]The pictures below show four Earth features. Which of these features are formed by underground reactions between acid in groundwater and limestone? A) 1 class=](https://us-static.z-dn.net/files/dcf/2cec785549a6bfd76432a750bf73505e.png)