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In this slice of sandstone there are many gaps between the sand grains, making the rock porous. As the gaps are connected, the sandstone is also permeable: any liquid or gas held in the rock can move through it. Rocks that are both porous and permeable are ideal reservoirs for storing oil and gas underground.
Te whakamahi i tēnei tūemi
by Nick Mortimer
Permission of GNS Science must be obtained before any use of this image.