Plate boundaries are classified by the relative motion of the plates involved (divergent, convergent, or transform) and by the type of lithosphere on either side (oceanic or continental); each boundary type is exemplified by well-known present-day tectonic features: oceanic divergent boundaries by mid-ocean ridges (e.g., Mid-Atlantic Ridge), continental divergent boundaries by continental rift systems (e.g., East African Rift), oceanic-continental convergent boundaries by subduction-related mountain/volcanic arcs (e.g., the Andes), continent-continent convergent boundaries by continental collision belts (e.g., the Himalaya), and transform boundaries by strike-slip fault systems (e.g., the San Andreas Fault).