Tectonic Plate
A slab of volcanic rock is called a "lava flow" or a "lava rock".
An extremely large, moving slab of rock that forms Earth's crust.
The slab that forms when magma forces itself across rock layers is called a dike.
Pipes
That would be either a zombie rock or Tectonic Plate. I'd go with the latter.
Vein
The slab of volcanic rock that is formed when magma forces itself across rock layers is called a dike. This will eventually build into mountains.
The process of picking up and moving rocks is called rock lifting or rock relocation.
sill
fracture
sulfur rock
As my submarine descended into the ocean trench, we passed by a slab of rock.