Following is a transcript of the video. Jeff Karson: Here we go. Abby Tang: This is lava. And this is also lava. One's man-made, and one's, well, coughed up by Mother Earth. But both these ...

Lava tubes are formed when lava cools and hardens on its top layer but continues to drain and cool beneath. Police say the man was found on Monday after friends reported that they had not heard ...