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After the original rock layers were deposited during the Flood event, hot waters rising from deeper inside the earth quickly enlarged cracks and conduits through the sedimentary layers, leaving behind vast passages and chambers. Later, water seeping from the surface continued to shape the underground world, forming the many and varied beautiful formations—stalactites, stalagmites, etc.
Most museums teach that cave formations take hundreds of thousands of years to form. However, through photo monitoring, some have been observed to grow several inches in just a few days!
For more information, visit www.answersingenesis.org/geology/caves/.
Cave Tour at Mammoth Cave National Park in Kentucky