These cave are actually Lava tubes, formed when lava continues to flow under a hardened surface. Then, when the source of the lava dries up, the tube drains, leaving a tunnel that can stretch for miles! Think of all the tubes that may exist deep in the earth, buried from one eruption after another.
Some of the ice was 2 feet thick and very clear. Each cave was a little bit different.



Did you know that one-third of Idaho is covered with lava. Idaho has the largest unbroken field of lava on the North American Continent, covering 23,000 square miles. The volcanic rock can be as thick as 5,000 feet that accumulated over a period of 30 million years..wOw!



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