Pumice is a volcanic "froth".
It depends where the rock was formed. If it was formed inside the earth, it would be rough. If it was formed on the surface, it would be smoother than the rock formed inside the earth.
volcanic neck
Surtsey
Crust
lava formed the volcanic mountains
Solidified Volcanic Ash
A volcanic mountain.
They were formed by the volcanic eruption
It was formed from a volcanic eruption
Volcanic islands are formed by volcanoes and are therefore composed of volcanic rock.
Lava
A volcano.
Pumice is a volcanic "froth".
It depends where the rock was formed. If it was formed inside the earth, it would be rough. If it was formed on the surface, it would be smoother than the rock formed inside the earth.
Marble is a metamorphic rock that can be formed into statues, and can be cut into floor tiles.
The volcanic ash burst and formed a huge cloud.