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| ratio of the volume of the pores of a substance to the total volume of the mass |
| central portion of the earth believed to be composed mainly of iron and nickel in a molten state |
karst
terrain usually characterized by barren, rocky ground, caves, sinkholes, underground rivers, and the absence of surface streams and lakes. It results from the excavating effects of underground water on massive soluble limestone. The term originally applied to the Karst, a limestone area on the Dalmatian coast on the Adriatic Sea, but has been extended to mean all areas with similar features.
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