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(music)

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Every year, NASA and NOAA scientists who study the ozone layer have

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expectations about how it might behave.

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This year, the ozone hole met those expectations.

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Temperature and the ozone-depleting substances in the stratosphere are two

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factors that affect the ozone layer over Antarctica.

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Atmospheric scientists track these factors from satellites, weather balloons

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and ground measurements to anticipate how the ozone layer will react.

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NASA and NOAA scientists expect the ozone hole to shrink slowly and