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What Is a Fissure. Granite is an igneous rock, which means it was created from hot lava flow from a volcano. Fissures are thin, nonstructural cracks that occur during the formation process of the granite.When two separate streams of molten lava or magma intersect, they can leave behind a small separation between them.ome types of granite like Absolute Black, which is a classification of stone known as a gabbro, rarely develop fissures, because the material making up the stone is extremely dense. Some types of granite, however, containing the mineral serpentine are extremely prone to fissures.
There are three kinds of answers: ones that are mostly right, ones that are mostly wrong, and those that once were right but now are wrong. Brain fissures are convolutions in the structure of the brain that form valleys between folds.The valleys are called fissures or sulci (plural of sulcus), and lie between the raised folds called gyri (singular gyrus).he fissures of a human brain are deeper than the fissures of the sheep brain. Edit. Share to: 1  About Cracked Heels and How to Relieve Them Cracked heels can be painful and unattractive. 2  They can also leave your feet susceptible to bacterial and fungal infections.