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.
   Answer:   Earthquakes generally happen in areas which are close to the  borders of tectonic plates beneath the Earth's surface. As the  plates slip against each other they do not slide smoothly but catch  and hold causing the earthquakes.