crevasse
CREVASSE!
"In anatomy, a fissure is a deep groove in any of various parts of the body." "The scientists were studying a deep fissure in the ocean floor." "Steam was erupting from a new fissure in the area of the geysers."
fissure
The medial longitudinal fissure divides the brain into left and right hemispheres.
Another name for deep gorge is canyon or ravine.
The scientist discovered a deep fissure in the earth's surface, evidence of the tectonic plates shifting below.
a groove is called a sulcus, but a deep groove is called a fissure.
The human brain has a transverse fissure. The fissure is a deep line that separates the cerebrum from the cerebellum.
Inter hemispheric fissure.
Crevice, fissure
fjord
fascicle