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.
Along Faults. Earthquakes can also occur far from the edges of plates, along faults. Faults are cracks in the earth where sections of a plate (or two plates) are moving in different directions. Faults are caused by all that bumping and sliding the plates do. They are more common near the edges of the plates.
Earthquakes occur as the edges of the continental plates slide over and under each other. Volcanoes are formed along high tension fault areas where the pressure of the plates pushing together cause the rock to melt from the pressure which finds its way to the surface in an effort to relieve the pressure.ell convergent boundarie(a plae where plates that move towards one another) one moves beneath the other one, thus forming mountains and volcanoes.... and transfrom boundaries(where two plates grind or slide against eah other) can be a fault line causing earthquakes.