Assertion: volcano's activity | /r/HasProperty | characterized by extrusion of viscous lava
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Source sentences:
text: Eruptions have occurred in 1991, 1998–1999 and from 2001 to the present day, with activity being characterized by extrusion of viscous lava forming a lava dome, and occasional larger explosions, forming pyroclastic flows and dusting the areas surrounding the volcano with ash and tephra.