Assertion: seamount's eruption | /r/CapableOf | generate the c tephra
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Source sentences:
text: Late in Summerland time, the explosive eruption that generated the C tephra 2,200-2,300 years ago also triggered lahars at the heads of several drainages (White, Cowlitz, and Nisqually), including one named the National Lahar, which moved for at least 100 km (62 mi) down the Nisqually River valley.