149508
Flow banding is caused by friction of the viscous magma which is in contact with a solid rock interface , usually the wall rock to an intrusive chamber or if the magma is erupted , the surface of the earth across which a lava is flowing .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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