This bingo card has a free space and 34 words: 6.5, cleavage, magma, limestone, sediments, sandstone, pebble, fracture, marble, granite, basalt, gneiss, breccia, dunite, glassy, intrusive, vesicular, red-brown, extrusive, prime meridian, equator, african, pacific, 2.5, Niagara Falls, Utica, Erie Ontario Lowlands, Allegheny Plateau, rate of change, gradient, silicon, oxygen, potassium and hardness.
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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.