The two main contributors to air pollution are:. A. farm animals and rain forest vegetation.
B. coal-fired power plants and automobiles.
C. sidestream smoke from cigarettes and pipes.
D. forest fires and volcanic eruptions.

Early 18th century british industries were generally small scale and relatively unsophisticated. most textile production, for example, was centred on small workshops or in the homes of spinners, weavers and dyers: a literal ‘cottage industry’ that involved thousands of individual manufacturers. such small-scale production was also a feature of most other industries, with different regions specialising in different products: metal production in the midlands, for example, and coal mining in the north-east.two illustrations of 18t