How do you describe pumice rocks?

Answer 1

A pumice rock is an extrusive rock as we all know it can float on water ,the only rock that can float on water it can float because of the holes that have formed due to gas bubbles while it was forming.

Answer 2

Pumice is essentially a glass that once contained water under high pressure when it was formed underground in a very hot molten state. Then, when it gets ejected out into the air from a volcano, the pressure reduces and the water explosively turns to steam.

If a sample of cold pumice rock is held in the hand, it will be a very lightweight material, white or nearly so, and full of bubbles and vesicles. Since it is essentially foamed silica, it is an abrasive substance.

Answer 3

Thrown out of an active volcano during an eruption, pumice is lava that is so full of gas bubble holes that pumice is very light and can sometime float. I remember my mother in Liverpool, England, in the 1950's using a pumice stone to wash, clean and whiten the front door step of the small terraced house we lived in at that time. Pumice stone is still used today, especially by women who used the pumice stone to sand away the hard skin on their heels.