fissies

Fissies, also known as "fissurettes" or "fissurets," are small, linear geological cracks or splits in the surface of the Earth or other celestial bodies. They are typically shallow and can occur in various geological settings, from rock formations to sediment layers. These features are often formed by tensional forces, such as those associated with tectonic plate movement or the cooling and contraction of volcanic materials.

The size of fissies can vary significantly, ranging from a few centimeters to several meters in length. Their width is usually very narrow, often only a few millimeters. Fissies can be found in both terrestrial and extraterrestrial environments. On Earth, they are commonly observed in arid regions, on cliff faces, or in areas where rapid temperature changes cause materials to expand and contract. On other planets and moons, such as Mars or Earth's Moon, fissies have been identified as evidence of past geological activity, indicating the presence of stress and fracturing in the crust.

The formation of fissies is a straightforward process driven by mechanical stress. When a rock or other material is subjected to pulling or stretching forces (tension), it can eventually fracture. If these forces are not strong enough to create a large fault, smaller cracks known as fissies will form. Repeated cycles of stress and relaxation can also contribute to their development and widening over time. They can sometimes be filled with secondary minerals or sediment, preserving a record of the geological environment in which they formed.