Geologists can use waves to learn about Earth’s interior. P waves travel faster than S waves. S waves travel through solids only, which tells geologists that the
core is liquid.

Geologists call the outer, solid area of Earth the crust; the next layer is the
. Finally, at the very center, is the core.

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

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