0
Pumice is acutally a volcanic rock. after the volcano erupts, the lava cools. It's mixed with water and cools very fast, which causes the water and air in the lava to be expelled quickly, causing holes.
Wiki User
∙ 12y ago
Wiki User
∙ 10y agoPumice forms when an erupting volcano releases a lot of magma that contains dissolved gases. This results in a sort of bubble-filled lava foam. When this cools, the cavities left by the bubbles remain in place.
Wiki User
∙ 10y agoThere are gases dissolved in magma, formed from chemical reactions when certain compounds are heated. The gas is trapped until the liquid rock reaches the lower pressure at the surface and begins to cool as a foamy lava. The bubbles of gas escape from the rapidly solidifying rock, leaving holes.
Wiki User
∙ 13y agoThe holes and depressions are gas bubbles, frozen in place as the lava was quickly cooled into rock.
Wiki User
∙ 8y agoPumice is formed from material ejected from a volcano. The holes are formed when gases inside the material cools
Wiki User
∙ 10y agoPumice has holes in it because its a vessicular rock and is formed when gases escapes from highly volatile rocks.
Wiki User
∙ 10y agoPumice comes from volcanoes. The holes are formed in the molten rock by gasses trapped underground. As the rock cools and solidifies, the gasses escape - leaving the holes behind.
Wiki User
∙ 10y agoThe gas in volcanoes
Add your answer:
Earn +20 pts
Why doesn't granite have air holes like pumice and scoria?
Pumice and scoria are volcanic rock. They form form the lava the erupts from the volcano and contains bubbles from gasses. These bubbles cause the cavities you're calling air holes.
Is pumice in a example of a mafic igneous rock?
No. Pumice is usually intermediate or felsic. The mafic equivalent of pumice is scoria.
Why does scoria have a similar texture to pumice but does not float on water like pumice?
Scoria has thicker vesicle walls than pumice does. This means it has a lower proportion of open space in it, making it less dense than water.
What rocks float?
Vessicular Rocks. Eg Scoria and Pumice.
Does scoria have mineral grains?
No. It is vesicular glass, like pumice.
Why does pumice float and scoria dosent?
Pumice is less dense than scoria. While they both have holes, pumices pore like holes trap air allowing it to float.
One kind of volcanic glass that has holes caused by pockets of gas?
Scoria is the best answer, but under some circumstances, probably pumice
Why doesn't granite have air holes like pumice and scoria?
Pumice and scoria are volcanic rock. They form form the lava the erupts from the volcano and contains bubbles from gasses. These bubbles cause the cavities you're calling air holes.
Why do rocks have holes in them?
In rocks such as basalt, scoria, and pumice the holes are formed from gas bubbles that were escaping from the molten rock as it cooled.
Is sandstone a scoria granite or pumice?
None of those. Scoria, Pumice and Granite are igneous rocks. Sandstone is sedimentary.
Will scoria float or sink in water?
scoria will sink but pumice will float.
Are Scoria and Pumice pyroclastic rocks?
yes
Can pumice be red?
No. However there is a similar rock to pumice called scoria, which is sometimes red.
Is pumice in a example of a mafic igneous rock?
No. Pumice is usually intermediate or felsic. The mafic equivalent of pumice is scoria.
What causes the frothy appeance of pumice and scoria?
Frothy rocks are caused by violent volcanic eruptions shoot out lava filled with gases. the lava cools quickly, while it is still in the air, and reaps the gases inside. rocks that form this ay are full of holes . two examples of these rocks are pumice and scoria
Why does scoria have a similar texture to pumice but does not float on water like pumice?
Scoria has thicker vesicle walls than pumice does. This means it has a lower proportion of open space in it, making it less dense than water.
What rocks float?
Vessicular Rocks. Eg Scoria and Pumice.
