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Magma or lava vents and gas vents. Also fumarole.
The 4 different types of solid pyroclastics are volcanic bombs, lapilli, volcanic ash, and volcanic blocks
a volcanic vent is a channel way or opening through which magma ascends to the surface
There are several different types of heat vents. Vents come in metals such as aluminum, copper, stainless steel, bronze, and brass.
magma or lava dried after a volcanic eruption.
== == Fumaroles are vents from which volcanic gases escape. == ==
Volcanic eruptions
Non-explosive and Explosive
Flow, and explosive
That varies widely between different types of volcanic rock. Obsidian or volcanic glass, is harder then pumice, but both are volcanic rocks.
volcanic vents
Volcanic vents that let off sulfuric steam.