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<em>Fossils are formed in many different ways, but most are formed when a living organism (such as a plant or animal) dies and is quickly buried by sediment (such as mud, sand or volcanic ash).</em>
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A difficulty that had to be overcome during the building of the Transcontinental railroad was Native raiding on work camps.
Both factory workers and slaves had to work long hours, and working conditions weren’t as sanitary as they are today.
