"extravasates" in the verb sense
1. extravasate
force out or cause to escape from a proper vessel or channel
2. erupt, belch, extravasate
become active and spew forth lava and rocks
"Vesuvius erupts once in a while"
3. extravasate
geology: cause molten material, such as lava, to pour forth
Source: WordNet® (An amazing lexical database of English)
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