This bingo card has a free space and 24 words: Geologist, mineral, meta-morphic, sedimentary, igneous, transparent, translucent, opaque, mohs, luster, shine, hardness, properties, observation, pressure, change, layers, volcanic, crystals, classify, field tests, talc, diamonds and sulfur.
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With players vying for a you'll have to call about __ items before someone wins. There's a __% chance that a lucky player would win after calling __ items.
Tip: If you want your game to last longer (on average), add more unique words/images to it.