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Lesson 21 Vocabulary
New Industries Develop During the Age of Big Business
Term | Definition |
---|---|
aluminum | A silvery ductile metallic element found primarily in bauxite. |
boom towns | Towns that grew quickly. |
oil refining | Process by which crude oil from the ground has been purified into useful products. |
cement | A fine gray powder mixed with water and small stones, sand, and gravel to make concrete. |
air brakes | An invention that allowed only on e man to stop an entire train. |