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| rich soil containing a relatively equal mixture of sand, silt and a smaller proportion of clay |
| ratio of the volume of the pores of a substance to the total volume of the mass |
| diastrophism (daɪˈæstrəˌfɪzəm) | |
| —n | |
| orogeny See also epeirogeny the process of movement and deformation of the earth's crust that gives rise to large-scale features such as continents, ocean basins, and mountains | |
| [C19: from Greek diastrophē a twisting; see | |
| diastrophic | |
| —adj | |