The amount of pore space in most unweathered granite is too small to support a plant-based ecosystem. But porosity grows as intact rock interacts with surface waters beneath the soil.
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Brantley, S. Rock to regolith. Nature Geosci 3, 305–306 (2010). https://doi.org/10.1038/ngeo858
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DOI: https://doi.org/10.1038/ngeo858