Assertion: volcano's magma | /r/CapableOf | erupt by volcano
Facets:
Source sentences:
text: The magma erupted by the volcanoes is formed by the partial melting of the mantle after fluids originating in the downgoing slab have altered the mantle; the magmas often undergo fractional crystallization and absorb crustal material.
text: The magmas erupted by all three volcanoes appear to originate in a common magma chamber at 20–35 kilometres (12–22 mi) depth, with seismic activity localized along the margins of the chamber.