volcano A volcano is any opening through which melted rock, ash, gas, steam, and small pieces of rock flow.
(A volcano; is; any opening through which melted rock, ash, gas, steam, and small pieces of rock flow) (any opening; melted; rock, ash, gas, steam, and small pieces of rock flow)
A volcano any opening
is melted
any opening through which melted rock, ash, gas, steam, and small pieces of rock flow
rock, ash, gas, steam, and small pieces of rock flow