it was cooled very very fast after it came out of the volcano giving it the bubbly, light feeling.
The process that could directly lead to the formation of pumice rock is volcanice eruptions (explosive eruption of lava from a volcano).
In short, pumice is less dense than water, so it floats. During the formation of pumice stone, air bubbles are incorporated into the stone itself. These air pockets make the overall mass of the stone much lower than you'd expect, and work like small floatation devices when the stone is placed in water.
It's a rock.
Pumice is a rock composed of volcanic glass. You shouldn't eat it period.
Explosive eruption of lava from a volcano
Pumice is a volcanic rock with no inherent mineral crystal shape or formation due to rapid cooling.
it got buried by 15-18 ft of pumice and ash in 79AD
Floating rocks: pumice. Non-floating rocks: all but pumice. Pumice can float on water because its density is so low, due to trapped bubbles of air which formed during its solidification from lava.
Pumice.
Pumice forms from the eruption of volcanoes. It occurs from hot pressurized rock that gets ejected from the volcano during eruption.
Tephra.. (not pumice - Pumice is the light stone which forms during an eruption)
No. Fly ash is ash left over from burning coal. Pumice is a porous rock produce during some volcanic eruptions.