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6. The Kármán Line is 19 meters (62 miles) above Earth’s Sea level and represents the boundary between Earth’s atmosphere and outer space. Because space is an empty vacuum, which of the following best describes what happens to sound waves as they travel through Earth’s atmosphere and reach the Kármán Line?

Sound waves cannot transmit past the Kármán Line and enter space.
Sound waves are absorbed as they pass the Kármán Line and enter space.
Sound waves refract and change direction at the Kármán Line as they enter space.