These features may create breccia-filled diatremes, which can form maars wh
These features may create breccia-filled diatremes, which can form maars when they reach the surface. These features' subglacial type can cause floods called jokulhaups, and flood basalts form when they affect oceans.(*) Lahars form when water mixes with pyroclastic flows from these geological features, and the collapse of craters in these features creates calderas. These features' shield type is exemplified by Mauna Loa. For 10 points, name these geological features, ruptures in the crust through which ash and magma escape.
These features may create breccia-filled diatremes, which can form maars when they reach the surface.