Fissure
Definition 1 of 4

Physical rupture
Use 'fissure' to describe physical breaks, emphasizing they're narrow and elongated.

The vase had a hairline fissure running down its side.
Geographical feature
'Fissure' can describe cracks caused by geological events, like earthquakes.

Geologists studied the fissure that formed in the valley.
Compare with
cleavecrackcrevicefracturegapopenriftsplit
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