Learn about the creation of sound and how sound waves travel
Description of sound waves.
© Josef Martha—sciencemanconsulting.com
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Contunico © ZDF Studios GmbH, Mainz; Thumbnail © Vincent Thedyono/Dreamstime.comStudying fossil coral to uncover information about Earth's history.
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Encyclopædia Britannica, Inc.Understanding energy flow in ecosystems.
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NASAPerhaps the most famous of all space films, these clips document the arrival of the first human beings on the Moon on July 20, 1969.