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.
Most earthquakes happen at a place where 2 tectonic plates touch. Earthquakes occur mostly in regions with stress between continental plates. This is the case in the Middle East, and along the rim around the Pacific Ocean (where it also causes volcanic activity in the regions, known as the Ring of Fire).