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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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