1.   Half a million fossil bones of reptiles and birds have been found in the lava tubes scattered across the landscape.

2.   A common feature of some flows, particularly of the pahoehoe type, are lava tunnels or lava tubes.

3.   At the Halona Blowhole, every few minutes the waves force great spouts of water to erupt through an old volcanic lava tube.

4.   Lava tube caves, formed centuries ago by molten basalt flowing through canyons, honeycomb southwestern slopes.