TONY CRADDOCK / SCIENCE PHOTO LIBRARY TONY CRADDOCK / SCIENCE PHOTO LIBRARY
Cooled pahoehoe lava. The "no parking" sign was originally at the side of the Chain of Craters Road, Hawaii. The solidified lava is pahoehoe lava from the Kilauea Volcano, this thick ropy-looking lava may flow at speeds of up to 50 kilometres per hour. Pahoehoe lava is a type of basic lava with a low silica content, giving it a low melting point. This means the lava can travel great distances from the crater or vent from which it issued. The Hawaiian islands are entirely made up of volcanic rock, and the continuous eruptions of volcanoes such as Kilauea, mean the islands are still growing in size.
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