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Follow the link below to see the answer to your question. Basically, what comes out of a volcano is the liquid, molten rock from inside of the earth known as magma. http://science.howstuffworks.com/volcano.htm/printable
There are several "fiery liquds" that emanate from volcanos. The most common is molten rock.
lower magma reserves or the volcano tube has closed/shifted.
It will plug up the volcano, which will usually keep the volcano from erupting for about 100 years. However, after that, the entire volcano itself will explode.
When a volcano erupts, the earth is opened up to produce lava, which is magma that has reached the surface. Sometimes, there are materials, or fragments, that are ejected from the volcano by the force of the volcano erupting. These blobs of lava are called Pyroclastic material.
An erupting hot spring is a geyser.
Lava is molten rock that spews from an erupting volcano. It is extremely hot, reaching temperatures as high as 1,300 to 2,000 degrees Fahrenheit (704 to 1093 degrees Celsius). In a volcanic eruption, lava is in liquid form. When it solidifies, it forms igneous rock. However, it can take quite a long time to cool, traveling great distances before becomes solid
Glass is made when sand is heated to such a high temperature that it's as hot as an erupting volcano. Not that I've actually tested this but the glass would most likely turn into liquid glass.
Some volcano words are: boiling hot lava molten metamorphic rock erupting tall volcano(of course)
Lava.
Lava is melted rock that comes from the volcano.
Lava or Magma.