what is formed on top of plate b

Based on the search results, it seems that plate B is associated with the formation of volcanoes. Specifically, plate B is a continental plate, and volcanoes are formed on top of it. The magma rises up on top of plate B to form volcanoes. Additionally, some of the search results mention that pillow basalt can be formed on top of the subducting plate and thrust onto the edge of the plate.