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All answers having "Igneous rock" as clue:

4 Character Answers:

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LAVA

SIAL

SIMA

TRAP



5 Character Answers:

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BOILS

MAGMA



6 Character Answers:

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BASALT

NORITE



7 Character Answers:

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AKERITE

DIABASE

DIORITE

EMOTION

GRANITE

SYENITE



10 Character Answers:

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MOLTENLAVA