Pumice forms from globules of lava that are full of gas bubbles. Those bubbles are still present when the lava solidifies.
In areas of past or present explosive felsic volcanism
Pumice - of volcanic origin - is not an intentional additive to food. It could be present, just like any dirt might be - in agricultural products grown in volcanic soils. Now, if you are referring to tomato pumice - which is a waste product of tomato juice production - that can sometimes be found in pet foods.
Pumice can be white, gray, or even pink.
No. Pumice is not magnetic.
No. Pumice is inorganic.
how did pumice get here
No. Pumice does not have grains.
Pumice is nonmetallic.
Pumice.
Yes. Pumice is defined as being highly vesicular.
Pumice is an extrusive igneous rock, not a mineral.