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#tufa #porous rock #limestone #spring deposit #travertine

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#scoria #porous rock #volcanic rock #igneous rock #vesicular

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#volcanic rock #porous rock #lava rock #lightweight stone #igneous rock

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#pumice #porous rock #light rock #floating rock #volcanic rock #igneous rock #vesicular rock

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#pumice #vesicular rock #porous rock #lightweight rock #floating rock #gas bubbles #extrusive rock

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#porous rock #pumice #volcanic rock #holes in rock #lightweight rock #aeration

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#porous rock #void space #permeability #airflow #earth science