Answer:
Ash
Fine particles of pulverized rock that are blown from an explosion vent. Measuring less than one-tenth of an inch in diameter, ash may be either solid or molten when first erupted. Ash is extremely abrasive, similar to finely crushed window glass, mildly corrosive, and electrically conductive, especially when wet.
Basalt
The most common type of rock formed from the cooling of lava. Basalt, which comes in a range of dark colors, contains a high percentage of iron and magnesium.
Caldera
The large, basin-shaped crater at the top of a volcano. A caldera is formed when the original peak collapses into an empty chamber below.
Dormant volcano
The term used to describe a volcano that is "sleeping," or presently inactive, but may erupt again.
Extinct volcano
A volcano that is not presently erupting and is not likely to do so for a very long time in the future.
