Assertion: volcano's activity | /r/HasSubevent | tephra
Facets:
value: with having thicknesses
type: OTHER
value: from phreatomagmatic and explosive eruptions
type: CAUSE
Source sentences:
text: Reactivated volcanic activity started between 25,000 and 14,700 years ago and led to the emplacement of ash flows, pumice layers and tephra from phreatomagmatic and explosive eruptions, with deposits having thicknesses ranging from 2–4 metres (6 ft 7 in–13 ft 1 in) in many places.