Vent
An opening in the ground where gas, steam, or molten rock can escape from inside a volcano. Vents can be small cracks you barely notice, or wide openings at the top of a crater.
Vent Gauge
A BFOE instrument that measures the pressure and flow of gas coming out of a volcanic vent. A sudden change in what the vent is doing is often the first sign that magma is moving underground — so the vent gauge is...
Volcanic
To do with volcanoes. Volcanic rocks are rocks made by volcanoes; volcanic activity is anything a volcano is doing; a volcanic island is an island that started life as a volcano rising out of the sea.
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