igneous
Common, hihgly porous types of volcanic rock are pumice and scoria.
Siliceous volcanic glass is also known as obsidian.
Igneous rock is made up of volcanic rock that is cooled after flowing as lava. Much of this type of rock is made up of sulphur and iron. Crystals also form from this type of melting.
Pumice
Extrusive igneous rock is produced by the solidification of lava.
a caldera
volcanic rock from cape verde
Common, hihgly porous types of volcanic rock are pumice and scoria.
volcanic rock , or even a type of rock in a classified section , sedimentary , metaphoric , or even igneous. the answer is volcanic rock a type of metaphoric rock. :)
Volcanic.
Volcanic rock is extrusive igneous rock.
The kind of rock you see forming in Puu Oo crater is extrusive igneous. This type of rock is formed by lava.
volcanic rock
A lot of Types
Volcanic Neck The surrounding rock weathers more easily than the magma in the pipe. The resultant structure will first appear as a low flat protrusion which is slightly elevated from its surroundings. With additional weathering of the surrounding rock, the hardened magma may appear as a tower with possible basaltic columnar structure known as a volcanic plug or volcanic neck.
a lava rock i think
Siliceous volcanic glass is also known as obsidian.