Sunday, August 21, 2011

Reticulite: An extreme form of pumice!

Reticulite is an extreme form of pumice formed within high lava fountains; about 1,000 feet, (300 meters), high, or more. Dissolved gasses within the lava form bubbles which expand until they burst, leaving behind a fragile,  honeycomb - like structure. In spite of its light weight, reticulite does not float. Drop a piece of reticulite in some water and it will sink much like chicken wire.

Photo: Warren Costa

Tuesday, August 9, 2011

New activity on Kilauea Volcano!

This image of Pu'u O'o was taken looking east. In the foreground is ponded lava, originating from several individual vents.

Photo: USGS