Rock Porosity: Understanding the Differences Between Sandstone and Granite

What does it mean that sandstone is more porous than granite?

a) Sandstone absorbs more water than granite.
b) Sandstone is denser than granite.
c) Sandstone is harder than granite.
d) Sandstone is less durable than granite.

The term porous refers to the ability of a rock to hold and transmit fluids

Explanation:

The term 'porous' refers to the capacity of a material to contain and transmit fluids, particularly water. When it is said that sandstone is more porous than granite, it means that sandstone has more spaces or 'pores' where fluids can be absorbed or passed through. Therefore, the correct answer to your question would be a) 'Sandstone absorbs more water than granite'.

This is due to natural gaps within the sedimentary material that sandstone is made from, compared to the very tight crystalline structure of granite, which does not allow for much absorption.

Rock porosity is an important factor in understanding the properties and behaviors of different types of rocks. Sandstone's higher porosity makes it more vulnerable to water absorption and weathering compared to the denser and less porous granite.

Overall, understanding the concept of rock porosity helps in evaluating the durability, weathering resistance, and fluid transmission capabilities of various rock types in different geological environments.