fissure
Definitions
A long, narrow opening or line of breakage made by cracking or splitting, especially in rock or earth.
A state of incompatibility or disagreement between two people or groups.
Examples
A deep fissure appeared in the ground following the powerful earthquake.
The climber carefully navigated the narrow fissure in the rock face.
There was a subtle fissure in their relationship that eventually led to a permanent separation.