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| ratio of the volume of the pores of a substance to the total volume of the mass |
| outer layer of the earth, about 22 miles deep under the continents and 6 miles deep under the oceans |
| fossil (fŏs'əl) Pronunciation Key
The remains or imprint of an organism from a previous geologic time. A fossil can consist of the preserved tissues of an organism, as when encased in amber, ice, or pitch, or more commonly of the hardened relic of such tissues, as when organic matter is replaced by dissolved minerals. Hardened fossils are often found in layers of sedimentary rock and along the beds of rivers that flow through them. See also index fossil, microfossil, trace fossil. fossilize verb |