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1
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A solid substance that occurs naturally in the earth
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2
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Kazimura Cave is located in this state
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3
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A soft rock that dissolves in weak acid
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4
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A hole in the roof of a sea cave where air and water shoot out
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5
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Flying mammal found in caves
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6
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A mineral deposited in limestone caves by water
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7
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A vertical underground passage
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9
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'World of the ice giants'
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10
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A deep ravine
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13
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An ___ cave is formed when meltwater drips into a rock cave and freezes
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14
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A vertical shaft, or drop, in a cave
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17
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A calcite rock formation around a pool of water in a cave
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18
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A funnel-shaped hole in the ground, where water flows into a cave
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20
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Mammoth Cave is located in this state
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21
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A person who explores caves as a sport or hobby
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22
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The Blue Grotto is found on this Italian island
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