-
stronger:rock,
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natural:matter,
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harder:formation,
-
geological:material,
-
raw:material,
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impermeable:material,
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basic:rock,
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natural:activator,
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crystalline:rock,
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extrusive:rock,
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harder:rock,
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floating:material,
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resistant:bedrock,
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alternative:material,
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sedimentary:rock,
Category Nuances for volcanic_rock:
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natural,
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geological,
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floating,
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stronger,
-
basic,
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alternative,
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crystalline,
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extrusive,
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raw,
-
impermeable,
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resistant,
-
harder,
-
sedimentary,
Simple Categories for volcanic_rock: