Alaska Subscriber. Answer: A triplane fracture extends through the transverse (growth plate), sagittal (epiphysis), and coronal (distal tibial metaphysis) planes of the distal tibia. It disrupts the tibial plafond intra-articularly.
Convergent Boundaries. Introduction. Convergent boundaries form when two crustal plates are colliding. The plates form a subduction zone with one plate descending beneath the other plate. One of the converging plates must be an oceanic plate to form a subduction zone.When two continental plates collide mountain ranges like the Himalayas form.Trenches form at subduction zones, USGS. Subduction zone. The subducting plate is being recycled as it begins to melt at about 100 kilometers.The water soaked oceanic plate forms molten rock that collects in magma chambers.ubduction zone. The subducting plate is being recycled as it begins to melt at about 100 kilometers. The water soaked oceanic plate forms molten rock that collects in magma chambers.
1 The boundary between two plates can be a divergent boundary, a convergent boundary or a transform boundary. 2  The lithosphere is composed of the crust, and some of the upper mantle. 3  Mature oceanic plate is approximately 80-100 km thick, of which, the upper 5-7 km is oceanic crust. An oceanic trench forms offshore, and a chain of volcanic mountains forms just inland of the coast. 2  This type of boundary between oceanic crust and continental crust is called an active continental margin since it is a plate boundary. 3  At other convergent boundaries, oceanic plate meets other oceanic plate.