A very large cave or system of interconnected caves is called ...

[jwb375]

A very large cave or system of interconnected caves is called a(n) ___________________ _. Fill in the blank(s) with the appropriate word(s).

Question 2

Rounded depressions common in regions having limestone bedrock are known as
  ___________________ _. Fill in the blank(s) with the appropriate word(s).

[pocatato]

Answer to Question 1

cavern

Answer to Question 2

sinkholes