Igneous rocks range from the highly porous pumice to the nearly non-porous granite. In some explosive eruptions of felsic magma, as is the case with pumice, the frothy mixture of rock and gas cools so rapidly that open vesicles are preserved, making it very lightweight and porous. With granite, the intrusive igneous rock has had a long time to cool underground, and with its interlocking crystalline structure, it has an extremely low porosity.
Most rock is permeable to some extent. The permeability of a body of rock will depend on its crystalline structure, texture, joints, faults and degree of weathering. Igneous rock is generally less permeable than other rock types.
they are a little bit because pumice is porous
Volcanic rock can be extremely porous (pumice) or non-porous (non-vesicular basalt).
Some are and some are not.
Gneiss is not porous.
no
Yes.
These are some porous rocks: chalk, limestone, sandstone, pumice, scoria.
Porous rocks are like sandy soil and water seeps through these rocks.
Volcanic rocks with gas bubbles are called vesicular. This, however, is a descriptive term rather than an actual rock types. Some vesicular volcanic rocks include pumice, scoria, and vesicular basalt.
porous
By bathstone I assume you mean Pumice which is a volcanic rock with bubbles of gas trapped inside. And yes, it is usually porous
Chincillas
please help me computer
No. It is a fine grained extrusive volcanic rock that is light in color. It is usually not porous.
Common, hihgly porous types of volcanic rock are pumice and scoria.
Obsidin rock, or volcanic glass is non-porous.
Porous rocks.
These are some porous rocks: chalk, limestone, sandstone, pumice, scoria.
Obsidian, volcanic glass, is quite non-porous.
The extrusive volcanic rock pumice can float on water. Other extrusive volcanic rocks are not so lucky.
Very porous rocks such as pumice can be very light and have the potential to float on water. Pumice is a volcanic rock.
Porous rocks are like sandy soil and water seeps through these rocks.
porous rocks are rocks through which water etc. can seep or pass through.