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- ..., lots of topography or a rapidly changing weathered layer such as glacial till). It also fails when there are extreme [[lateral]] velocity variations in t7 KB (1,117 words) - 17:51, 25 January 2022
- ...s of organic material change into peat, lignit, subbituminous, bituminous, till antrachite, as the influenced of pressure and temperature.11 KB (1,551 words) - 16:49, 11 January 2016