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オゾンホール
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Noun
1. ozone hole​
Wikipedia definition
2. Ozone depletion​Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth's stratosphere, and a much larger springtime decrease in stratospheric ozone over Earth's polar regions. The latter phenomenon is referred to as the ozone hole. In addition to these well-known stratospheric phenomena, there are also springtime polar tropospheric ozone depletion events.
Read “Ozone depletion” on English Wikipedia
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Other forms
オゾン・ホール

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