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Pumice
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∙ 11y ago
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Is obsidian extrusive rock?
No. Obsidian is volcanic glass. Glass is amorphous and thus noncrystalline.
A rock that forms from cooling lava is classified as an?
An extrusive igneous rock.
What kind of rock is tuff?
Tuff is considered an extrusive igneous rock.
Is granite rock a extrusive rock?
No, granite is the most common intrusive igneous rock.
What is category of igneous extrusive rock?
Some igneous extrusive rocks include obsidian, basalt, andesite, rhyolite, scoria, pumice, basaltic glass. If you want more, go to page 6 on the Earth Science Reference Tables at the related link.
What is a light frothy extrusive rock formed when lava cools so fast that it traps pocket or air inside?
Pumice rock.
What light frothy extrusive rock is formed when lava cools so fast that it trap pockets of air inside?
This is known as pumice.
What are Frothy volcanic rock are called?
Pumice is a frothy, bubbly, light volcanic rock.
What are the characteristics extrusive igneous rocks?
In addition to having small crystals, an extrusive igneous rock can: Be glassy or frothy in appearance. Be felsic, intermediate, mafic, or ultramafic in nature. Be porous or full of bubbles. Be light enough to float (pumice).
What is a light glassy rock formed from frothy lava?
Pumice.
What extrusive rock has a very low density?
An extrusive igneous rock has a very low density. This light colored rock is also known as a volcanic rock.
What does pumice mean for rocks and minerals?
Pumice is an extrusive igneous rock which forms when the lava is very frothy from a lot of gas exsoliving out of the lava, it is sort of like an extrime vesicular rock.
Are river rocks porous?
No. It is a fine grained extrusive volcanic rock that is light in color. It is usually not porous.
Is Rhyolite Porphyry an intrusive or extrusive rock?
Rhyolite is a felsic volcanic rock.
Is Obsidian an extrusive rock or intrusive rock?
Yes it is extrusive love yall
What is a naturally occurring igneous rock more correctly called obsidian?
Obsidian is also called volcanic glass, an extrusive, largely non-crystalline, felsic igneous rock. Pumice is also a frothy form of obsidian.
What is the name of the igneous rock that is light enough to float?
Pumice, an extrusive igneous rock. Pumice is very porous and therefore allows air to get trapped when it is in water. Pumice stones are formed when lava cools quickly, they are usually white in colour and have a heavily pitted surface.
