Underground soft rock? (5)
I believe the answer is:
magma
(Other definitions for magma that I've seen before include "Hot material" , "Hot molten rock" , "That's hot!" , "crust's content" , "hot stuff" .)
I believe the answer is:
magma
(Other definitions for magma that I've seen before include "Hot material" , "Hot molten rock" , "That's hot!" , "crust's content" , "hot stuff" .)