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Bluffs, or walls of stone, that rise along the banks of a river provide clues to the type of bedrock that lies under the water. Before construction begins, geologists must examine this bedrock for faults or cracks that could destroy a dam. Would a town with businesses on its riverbanks be a good place to build a dam? What else should people consider when deciding where—or whether—to build a dam? ©1997 National Geographic Society. All rights reserved. |
