Kalapana, a small community which was "melted" by lava a few years ago. Although lava flows very slowly, about 6 miles a day, there is little one can do to stop the lava. There are three types of lava; A'a, a "crunchy" type of cinder lava, filled with air bubbles, Pahoehoe is the exact opposite of A'a, it is a twisted,smooth,ropey lava, and lastly, basalt which is a very smooth, dense, heavy lava, with no air bubbles at all. At Kalapana the 2200 degree fahrenheit molten rock reaches the cold Pacific Ocean, exploding into steam. Recently opened by the National Park Service is a trail that goes out to where the lava enters the sea. You drive out on a dirt road then hike for about 30 minutes. From there you can view the lava exploding and steaming. Olivine, a green, sparkling, glasslike crystal often accompanies lava. It is found in tiny chunks, about the size of a grain of rice.