Network of Secret routes and safe houses
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Urbanization, the process by which large numbers of people become permanently concentrated in relatively small areas, forming cities. Read More on This Topic history of technology: The Urban Revolution (c. 3000–500 bce)
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The temperature of the earth's surface drops as it gets further away from the sun. Venus is an exception because its dense atmosphere works as a greenhouse, causing the surface to heat up to temperatures exceeding the melting point of lead, which is around 880 degrees Fahrenheit.