Assertion: eruption column | /r/CapableOf | fall down the flanks of the volcano
Facets:
value: to form surge
type: PURPOSE
value: to form a pyroclastic flow
type: PURPOSE
Source sentences:
text: In this case, the eruption column is too dense to be lifted high into the air by air convection, and instead falls down the flanks of the volcano to form a pyroclastic flow or surge.