Harriet Tubman was an African American slave. She first risked her life when she developed the "Underground Railroad", which was a secret system that she created in order to help fugitive slaves escape. The second way that she risked her life was becoming a nurse during the Civil War.
<span>Copernicus completely changed people's minds in the way they perceived the world and the planet in general. He shifted away Ptolemaic model of the heavens, and developed his own theory of the heliocentric model in which the Sun is placed at the center of the Solar System. As well as this person, most of the talented scientists of renaissance brought into people's life something new and, in some measure to those who was not prepared for big changes, shocking things.</span>
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It looks like children working in a coal mine so i guess Gases, Mines could collapse, and possibly get sick from fumes or something.
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