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| central portion of the earth believed to be composed mainly of iron and nickel in a molten state |
| capability of a porous rock or sediment to permit the flow of fluids through its pore spaces |
| underthrust (ˈʌndəˌθrʌst) | |
| —n | |
| geology Compare overthrust a reverse fault in which the rocks on the lower surface of a fault plane have moved under the relatively static rocks on the upper surface | |