* Porosity: Sandstone is made up of sand grains, which are not perfectly packed together. This leaves spaces or "pores" between the grains. The percentage of these spaces within the rock is called porosity.
* Permeability: Permeability refers to how easily fluids (like water) can flow through the connected pores within a rock. Sandstone's porous structure allows water to move through these interconnected pores.
Here's why sandstone is porous and permeable:
* Shape and size of grains: Sand grains are generally rounded and relatively large, leaving significant spaces between them.
* Cementation: The cement that binds the sand grains together doesn't completely fill the spaces between them, allowing for water flow.
In summary: The combination of porosity (the presence of pores) and permeability (the interconnectedness of pores) makes sandstone a highly permeable rock, allowing for easy water flow.
