A sill (assuming you are talking about horizontal layers of rock)
Pumice is a frothy, bubbly, light volcanic rock.
Pumice. It floats on water due to its vesicular structure.
No. Volcanic rock is extrusive igneous rock, which cools at or above earth's surface. However, igneous rocks can form from magama that cools inside the earth as well. This is called intrusive igneous rock, sometimes called plutonic rock.
Obsidian falls under the group of Extrusive Volcanic Rock of very fine texture. Obsidian is generally called Volcanic Glass.
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.
A sill (assuming you are talking about horizontal layers of rock)
Pumice is a frothy, bubbly, light volcanic rock.
A tectonic plate is a massive, irregularly shaped slab of solid rock. These plates can make volcanic activity, mountains, and several other things as well.
igneous rock
It's called a volcanic sill.
The slab that forms when magma forces itself across rock layers is called a dike.
Pipes
Tectonic Plate
Pumice. It floats on water due to its vesicular structure.
Volcanic rock refers to a rock that forms from the molten material released by a volcano or a volcanically active site. Because all the molten material, called lava or magma, from a volcano is simply rock at a liquid state, is still rock, yes, volcanic rock is just a rock.
it is called a volcanic eruption