Cracks in the Earth, also known as FISSURES and CREVICES, are fractures in the surface of the Earth caused by tectonic activity. FISSURES are long, narrow openings that can be seen on the surface of the Earth, while CREVICES are smaller and more shallow. These cracks can range from a few centimeters to several kilometers in length and depth. They can be found in areas of high seismic activity, such as near volcanoes or along fault lines. Cracks in the Earth can cause landslides, earthquakes, and other geological events.