Volcanic rock (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">volcanic rock</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lava that I've seen before include "Volcanic stream" , "Molten volcanic material" , "Stuff heatedly hurled out" , "Volcanic emanation" , "Volcanic flowing rock" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">volcanic rock</span>' is the definition.<br/ ><span class="explanation-format__explanation">(basalt is a kind of volcanic rock)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for basalt that I've seen before include "Rock containing olivine" , "Black volcanic rock" , "Common volcanic rock" , "rock from 2 [VOLCANO]" , "Dark rock of volcanic origin" .)