1 Inflammation of the gingiva, bone loss, and increased gingival recession may progress slower than with other forms of periodontitis.  Periodontitis Associated with Systemic Diseases - Systemic diseases, such as heart disease, diabetes, and certain forms of arthritis, may have a correlation with periodontitis.
Main Content. An earthquake is ground shaking caused by a sudden movement of rock in the earthâs crust. Such movements occur along faults, which are thin zones of crushed rock separating blocks of crust.
Earthquakes occur when the plates that are continually moving get stuck; as the rest of the plates move, the stuck parts deform like a compressed spring and build up stress. The rocks underground break along a fault or a pre-existing fault slips causing the plates move and cause an earthquake.