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Molten rock erupted onto the surface of the Earth Lavas vary according to the chemistry of the molten rock In general the more silica they contain, the more viscous they are Basalt, a silica-poor lava tends to flow easily and therefore form thin, extensive lava flows, while rhyolite lava is so viscous it rarely flows and forms 'domes' above the site of the eruption.
The melted rock ejected by a volcano from its top or fissured sides.
It flows out in streams sometimes miles in length.
Rock that in its molten form issues from volcanos; lava is what magma is called when it reaches the surface.
General term for molten rock that is extruded onto the surface.
Magma which has reached the surface through a volcanic eruption The term is most commonly applied to streams of liquid rock that flow from a crater or fissure It also refers to cooled and solidified rock.
Molten rock extruded onto the Earth's surface, or the resultant solid rock.
Molten rock that is capable of flowing on the surface or in lava tubes See 'pahoehoe' and 'aa' for specific types.
Molten rock issuing from a volcano or volcanic vent.