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| seepage of water into soil or rock |
| to dissolve out soluble constituents from ashes and soil by percolation |
tufa (t 'fə) Pronunciation Key
A soft, friable, and porous sedimentary rock consisting of calcium carbonate and formed by the evaporation of water, especially at the mouth of a hot spring or on a drying lakebed. It is similar to, but harder than, travertine. |