Leaving the coastal areas and entering the inner parts of Iceland, you’re faced with a completely different, but also very interesting and unique, landscape.
The ground is covered by volcanic ashes, small pieces of very sharp stones. This material has nothing in common with ashes remaining after a fire. You can compare it to the iron blast furnace slag, when the iron is melted out of the ore by a steel plant. Do you know pumice stone? Both types of natural pumice stone (black and gray) are eruptive stones. They are quite soft compared to these black material.