9892188
9781587283277
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-- Integrates science, math, technology and language arts ideas.-- Investigates a path of unseen events, such as how a sunbeam travels to earth or what the speed of sound is.-- Packed with question and answer sections, factfiles, graphs, and diagrams.Grimshaw, Caroline is the author of 'Energy (Invisible Journeys)' with ISBN 9781587283277 and ISBN 1587283271.
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