Lava
The stuff that pours out of a volcano is called lava.
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Lava and rock explode out of the volcano then lava pours down the volcano covering the land then turning into rock making the volcano bigger.
lava that pours out of the vent and hardens on previous layers of lava ( Hawaiian islands / medicine lake)
Nonexplosive Eruption
Molten rock that pours out of a volcano is called lava. Lava is the liquid rock that flows from a volcano during an eruption.
When the lava pours out of the volcano not all of it makes it completely down the volcano. Thus some of it stays near the top and the volcano just gets higher and higher.
Technically, it is not lava until it pours out of the volcano. While it is in the volcano it is still magma. What is not ejected in the form of lava might sink and form a plug, allowing the magma to once again build up in the volcano's magma chamber.
Things that are viscous (pours out thick) are , but are not limited to, molasses, tar, honey, etc.
The predicate is "pours."