Crossword puzzle clue "it may harden into obsidian"

Here are the possible solutions for it may harden into obsidian clue

Answer
Clue
Relevancy
lava
Clue
It may harden into obsidian
Molten rock that can harden into obsidian
Obsidian source
Obsidian, once
Source of obsidian
Obsidian, originally
Definition
molten rock that issues from a volcano
resin
Clue
Sticky plant secretion that may harden into amber
Definition
any of a number of substances or products obtained from the sap of certain plants and trees
ossify
Clue
Harden into bone
Definition
to change into bone; to become callous or conventional

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