Sec. 66. "Sinkhole" means a natural depression in the surface of the land caused by the collapse of the roof of a cavern or subterranean passage. As added by P.L.98-2026, SEC.2.
"Sinkhole"
Ind. Code § 15-16-1.5-66, under Fertilizer Definitions.
Ind. Code § 15-16-1.5-66