Assertion: volcano's magma | /r/CapableOf | reach the surface
Facets:
Source sentences:
text: The main vent of a volcano is the outlet chamber in the Earth's crust that allows hot magma to reach the surface.
text: If, when magma reached the surface it came into contact with water, either the sea, groundwater or a river, then an explosive eruption occurred.
text: If, when the magma reaches the surface, it comes into contact with water, then instantaneous and continuous phreatomagmatic explosions will occur, building a 500 m high eruption column and propagating shock waves.
text: Magma reaches the surface, an initial explosion sends a shock wave radiating out from the eruption point.
text: Methods include studying a volcano's history and looking for expanding cracks or swelling on its slopes as the magma reaches the surface.