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.
There are transform faults which the earth crust rubs past each other. Mid ocean ridges and rift valleys which divergence takes place, and deep ocean trenches where convergence takes place. The biggest earthquakes happen at subduction zones though. An earthquake is caused by a sudden slip on a fault.