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What is Fissure and explain in detail?
A fissure is a long, narrow crack opening along the surface of Earth. The term is derived from the Latin word fissura, which means cleft or crack. Fissures emerge in Earths crust, on ice sheets and glaciers, and on volcanoes.

Ground fissure
A ground fissure, also called an earth fissure, is a long, narrow crack or linear opening in the Earths crust. Ground fissures can form naturally, such as from tectonic faulting and earthquakes, or as a consequence of human activity, such as oil mining and groundwater pumping. Once formed, ground fissures can be extended and eroded by torrential rain. They can be hazardous to people and livestock living on the affected surfaces and damaging to property and infrastructure, such as roads, underground pipes, canals, and dams.In circumstances where there is the extensive withdrawal of groundwater, the earth above the water table can subside causing fissures to form at the surface. This typically occurs at the floor of arid valleys having rock formations and compacted soils with a high percentage of fine-grained material.

Crevasse
A crevasse, also called an ice fissure, is a deep linear crack in an ice sheet or glacier resulting from  the opposing force produced by their movement at different rates of speed. The force builds until their associated shear stress is sufficient to break the ice along the faces. The breakage often forms vertical or near-vertical walls, which can melt and create seracs, arches, and other ice formations. A crevasse may be as deep as 45 metres (148 ft) and as wide as 20 metres (66 ft). A crevasse may be covered, but not necessarily filled, by a snow bridge made of the previous years accumulation and snow drifts