The pyroclastic igneous rocks have turned into pebbles after floating on water and rubbing against one another for two months or so. Banks of pumice have covered the surface of the sea along the ...

The stretch of golf-ball-size pumice rocks was first spotted this week by a New Zealand air force plane about 1,000 kilometres northwest of Auckland. The rocks stretch for about 26,000 square ...

Pumice stones generated by the eruption of Fukutoku-Okanoba, an undersea volcano 1,400 kilometers away, cover parts of the fishing port of Hentona, Okinawa Prefecture, on Oct. 25. The floating ...