What are the different types of volcanic rocks?lava bomb,pumice,obsidian,limestone,grWhat are volcanic rocks used for?
volcanic rocks are used for heaps of things obsidian is used for making knifes pumice is used for scrubbing the dead skin off your feet.
Pumice -
Where is pumice found?At the panmure basin and beaches.
How it is formed:Pumice is formed by gas bubbles that were trapped in the rock.
What it is used for:scrubbing the dead skin off your feet.
Obsidian -
Where is obsidian found?Around some mountains like mount wellington.
How it is formed: Obsidian is formed as an extruded igneous rock.
What it is used for:obsidian is used for making knives.
Lava bomb -
Where is it found?around lots of mountains like mount rangitoto.
How it is formed:lava bomb is formed when a volcano ejects viscous fragments of lava during an eruption.
What it is used for:lava bomb is used for volcanologist to study how its formed.
