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The Underground Railroad, a vast network of people who helped fugitive slaves escape to the North and to Canada, was not run by any single organization or person. ... Still, it effectively moved hundreds of slaves northward each year -- according to one estimate, the South lost 100,000 slaves between 1810 and 1850.
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English scientist; he invented the dynamo—a machine that generated electricity. His invention eventually led to today's electrical generators. Which then led to telephones because telephones needed electricity to function
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Tides are the periodic rise and fall of surface water caused by the gravitational force of the moon and the sun and by the rotation of the earth. The movements of the solar system that influence the tides are predictable; therefore changes in tide height and time are predictable.
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I think the right answer is c
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