Foggy Cave (Lava Tunnel)
Foggy
Cave is the remains of one collapsed lava tunnel.
It is 6 m high, 18 m wide and 200 m long, with an oval-shaped
entrance. The wet air is liquefied that forms fog near
the entrance because the temperature is low and the air is humid in the cave.
Because of the fog, gorgeous rainbow often occurs in the sunlight. More
interestingly, the fog will disappear when visitors
step in, and appear when they step out. Can you tell the reason for it?