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This Concept Map, created with IHMC CmapTools, has information related to: Measuring Time pp 19-27, Time measured by Clocks, Pendulum movement powered by Springs, Clocks can be Pendulum movement, Time measured by Calendars, Pendulum movement powered by Weights, Pendulum movement powered by Electricity, Clocks can be Sun dial, Sun dial uses Dial shadow, Pendulum movement turns Gears