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Pumice is formed by the rapid cooling of gas entrained (frothy) felsic lava which is erupted from volcanoes. If the amount of trapped gases in the lava is high, and cooled quickly enough to trap the bubbles of gas before they can escape, vesicular pumice will be formed, resulting in the only igneous rock that is able to float in water.
Obsidian is formed from the extreme rapid cooling of lava.
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∙ 11y ago
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Is pumice and obsidian exaples of minerals?
No. Pumice and obsidian are rocks composed mostly of glass.
What is example of igneous rock?
Basalt and pumice.
Name 4 kinds of igneous rocks?
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
What is the common name for obsidian rock?
Volcanic glass, or pumice (vesicular obsidian).
What type of rock is formed by cool lava or magma?
An igneous rock is formed when magma cools and hardens. Some examples of igneous rocks are pumice and obsidian.
What is the difference between obsidian and pumice?
Pumice is formed from frothy lava. Obsidian is not. Both have cooled rapidly from lava.
Is the metamorphic rock obsidian or pumice?
Neither. Both pumice and obsidian are igneous.
Is pumice and obsidian exaples of minerals?
No. Pumice and obsidian are rocks composed mostly of glass.
Why is a piece of pumice lighter than a piece of obsidian equal size?
Because pumice is lighter than obsidian always. That means obsidian weighs more than pumice.
Pumice obsidian and scoria are kinds of?
These are all formed by volcanic activity. Igneous
What is example of igneous rock?
Basalt and pumice.
Why doesn't pumice or obsidian turn into a metamorphic rock?
Pumice and obsidian are both forms of volcanic glass, which weathers away fairly easily.
Name 4 kinds of igneous rocks?
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
What is the common name for obsidian rock?
Volcanic glass, or pumice (vesicular obsidian).
Is pumice and obsidian forms of volcanic gas?
Partially correct. Pumice forms from rapidly cooling lava containing volatiles (water and gas) and obsidian forms from rapidly cooling lava that doesn't contain volatiles. Bubbles from volatiles are frozen in place and cannot escape before the lava hardens forming pumice. Obsidian and pumice are sometimes found together although obsidian itself is relatively rare.
What type of rocks are pumice obsidian and granite?
Igneous rocks
Name a volcanic rock?
Obsidian, basalt, andesite, pumice.
