Anthracite lignite bituminous coal peat
1. A low-rank brown-to-black coal containing 30 to 40 per cent of moisture. It is liable to spontaneous combustion.
2. A soft brown deposit in which plant structures can easily be seen. It has the least amount of carbon.
3. The main feature of this grade of coals is its low percentage of volatile matter and high caibon content.
4. This coal has more than 14 per cent of volatile content. There are non-coking and coking varieties, the latter being used for coke manufacture.
32. Заполните пропуски в предложениях, используя следующие слова: a) continue continuous continuity
Unit 6______________________________________________ 155
1. Fossil fuels ... to play an important role in the national economy of the country.
2. Like other sedimentary strata coal beds are characterized by uniformity and ....
3. In mining bedded deposits ... faces (забои) are used.
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