Multiple choice

Which of the following is the most porous rock?

  1. Basalt

  2. Granite

  3. Sandstone

  4. Slate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sandstone is a sedimentary rock composed of sand-sized mineral particles or rock fragments. It has significant porosity (typically 10-30%) and permeability due to the spaces between grains. In contrast, basalt, granite, and slate are much denser with very low porosity, making sandstone the most porous option.

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