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Pumice is formed by very rapid cooling of lava that has commonly been ejected under high pressure.
This sudden pressure loss causes gasses to come out of solution from the lava making it "frothy". The rapid cooling, traps the gas bubbles in the solidified rock, meaning that pumice is filled with a very large number of void spaces, has a very low density compared to most other rocks and a very high porosity.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoScoria is similar in its vesicular appearance, but darker and it will not float.
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Is pumice and obsidian exaples of minerals?
No. Pumice and obsidian are rocks composed mostly of glass.
Name 4 kinds of igneous rocks?
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
Are Scoria and Pumice pyroclastic rocks?
yes
List of igneous rocks?
basalt and pumice
What kind of igneous rocks does a volcanoe make?
pumice
Is pumice used to polish other rocks?
NO
What kind of rock can actually float?
PUMICE. Pumice is created by volcanic activity. It looks different from other rocks and even feels light when you hold it in your hand, but it's a genuine rock.
What rocks float?
Vessicular Rocks. Eg Scoria and Pumice.
Can pumice rocks float to the Florida coast?
Pumice rocks have been known to float across oceans.
What rocks have a pyroclastic texture?
Two kinds of rocks that have a pyroclastic texture are breccia and tuffs. Some other rocks with this texture are volcanic ash and pumice.
Does pumice have calcite?
No. Pumice is a volcanic rock. Volcanic rocks do not contain calcite.
What type of rocks are pumice obsidian and granite?
Igneous rocks
How is pumice economically important?
It provides employment for those who gather volcanic rocks and profits for those who convert those rocks to pumice.
Is pumice and obsidian exaples of minerals?
No. Pumice and obsidian are rocks composed mostly of glass.
Name 4 kinds of igneous rocks?
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
What are pumice rocks used for?
typically, Pumice rocks are used to scrape the rough areas of feet so that they are smooth
Are Scoria and Pumice pyroclastic rocks?
yes
