Nephrolepis brownii fern in hardened lava. Close-up of the fronds of a Nephrolepis brownii fern growing within cooled and hardened pahoehoe lava. This thick ropey-looking lava can flow at speeds of up to 50 kilometres per hour. It may harden in smooth sheets or ooze out and solidify into twisted rope-like formations (seen here). 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. Photographed on Big Island,Hawaii,USA | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Szoenyi, Michael |
Bildgröße: | 5173 px × 3449 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |