Times (UK): THE clash between molten rock and ice on the surface of the Iceland volcano has produced ash so fine that radar and other aircraft instruments are unable to detect it. The near-invisibility of the ash swirling in vast clouds over Britain and Europe has magnified the confusion and trepidation brought about by the eruption of Eyjafjallajokull. Now the uncertainty is set to increase still further, with scientists warning that, based on the volcano’s historic behaviour, the …