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Lava is a type of viscous liquid so it's not really an either/or question, it's both.
Originally posted by CaptainBeno
Ok, nothing to out there but could someone tell me what these features are on the Moon. It appears they are Veins or Valleys carved by a liquid? Is / was that possible? Or are they lava tube type features?
Leading theories include lava channels, collapsed lava tubes, near-surface dike intrusion, nuee ardente (pyroclastic cloud), subsidence of lava-covered basin and crater floors, and tectonic extension. On-site examination would be necessary to clarify exact methods.