Just like ʻaʻā flows, the molten inside with the stream, and that is retained insulated because of the solidified blocky floor, advancements in excess of the rubble that falls from the stream entrance. In addition they shift much more gradually downhill and therefore are thicker in depth than ʻaʻā flows. https://milowwtpm.bloggazzo.com/12682830/lava-things-to-know-before-you-buy