12. Заполните пропуски • предложениях, используя следующие слои. а) consolidate consolidation consolidated «consolidated 1. ... is the process of cementation of loose fragments of sedimen tary rocks. 2. As is known, sedimentary rocks ... under the pressure of over laying beds. 3. Limestone, for example, is the ... rock which occupies vast areas of the Earth's surface. 4. Gravel, sand and clay form the group of... mechanical sedi ments, because they consist of loose uncemented particles. Б) stratify stratification stratified 1. Bedding or ... is the most characteristic feature of sedimentary rocks. 2. Coal is a ... deposit that has been developed from plant re mains. 3. Coals ... by the decay of organic material. 4. As a result of physical, chemical or biochemical changes veg etable remains are ... and changed into peat or coal, micro-organisms remains changed into mineral oil, bones into phosphorite, etc.