The correct option is: "Londoners developed breathing problems due to the smog. - Coal mines polluted the surrounding environment."
Coal was the main source of energy for the first Industrial Revolution, fueled the steam engine and was crucial in the steel industry. Until the industrial revolution, the most used energy came from wood and charcoal. Its consumption was producing a huge deforestation.
Although the operation of the mines (iron beams to support the galleries, methods of ventilation, methods to extract the water, use of trolleys on rails) was greatly improved, in order to increase the productivity, the work in them became something very dangerous and very painful.
The Industrial Revolution in the mid-eighteenth century caused many people to move from the villages to London, shooting the smog during the winters. Its high point came in the winter of 1952. London was paralyzed for five days by smog.
Bartholomew Diaz, who was sponsored by Portugal, had just rounded the tip of Africa. Ferdinand and Isabella were desperate to find a way to India (Asia) before Portugal. They were looking for a new way to get there faster.
Columbus had already tried to go to Portugal, but, as said before, Diaz had just rounded the Cape of Good Hope, so Portugal didn't want/need a new idea.
Hope this helps! Please let me know if I'm wrong :)
Answer:
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Explanation:
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Adding on to the first answer ^^^
Primary sources can also be unreliable as they are biased depending on the source.
If comparing histories of different countries, they tend to describe more victories rather than failures. Also, having a picture as a primary source can be misleading as it can be interpreted in different ways. Sources written in the first person can also have their own biased from the environment the author has lived in.
America First is best known as the slogan and foreign policy advocated by the America First Committee, a non-interventionist pressure group against the American entry into World War II, which emphasized American nationalism and unilateralism in international relations.
