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As a fast-moving boat skims along the water surface, it creates ring-shaped waves that extend away from the path of the boat. If the boat is moving faster than the waves it creates, the waves form a larger, bow wave, as shown in the illustration.
Referring to the illustration, why do the circles become smaller from west to east?

Explanation

The boat is moving from west to east. The waves farther west were created earlier than those that are farther east and have had more time to travel away from the boat’s path.

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