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level below which the ground is saturated with water
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water containing magnesium, calcium, or iron salts
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a spring or pit filled with boiling red mud
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a hole in/near a volcano that releases vapor
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a hot spring that intermitently sends up spouts of water
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limestone is under the surface and gets worn away by acid and water under ground... it rains and the ground sinks into the hole left by the limestone
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an underground cave like chamber
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ground underneath surface is worn away leaving a bridge like structure
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an icicle shaped mineral deposit usually formed of calcite or aragonite reaching down from a cave floor
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an icicle shaped mineral deposit usually formed of calcite or aragonite reaching up from a cave ceiling
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Calcium carbonate in the form of stalactites or stalagmites
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