👉 Plagiostome is a type of plate tectonic plate that forms the outer boundary of the Earth's lithosphere. It consists of two plates, separated by an oceanic crust. The formation of plagiostomes is believed to be caused by the collision of two large continental blocks, which collided with each other under the influence of the Earth's gravity and heat. The term "plagiostome" is used in geology to describe a plate that has formed from a collision between