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.