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.
Where do earthquakes happen? Over 90% of earthquakes â including almost all of the largest and most destructive ones â happen at or near so-called plate boundaries, where the 15 or so major subdivisions (âplatesâ) of the Earthâs crust and uppermost mantle move towards, alongside, or away from each other [1].