Caves are cavities in the earth formed by any of a variety of geological processes.
Some are mere hollows created by the erosional action of wind, running water, or waves. Lava caves form when the interior of an advancing lava flow remains molten and moves from underneath the cooled, hardened lava surface, leaving behind a sinuous tube. If the bedrock through which this water passes is limestone, the rock minerals may dissolve to form a cave. Notify a responsible person that you are going caving, giving the name and location of the cave. Also state the approximate expected time of return.