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In page Klyuchevskaya Sopka:
"On 7 December, activity at Kliuchevskoi significantly increased, having continued during 29 November – 7 December, prompting KVERT to raise the Alert Level to Red. Ash plumes rose to altitudes of 5.5–6 km (18,000–20,000 ft) above sea level and drifted more than 212 km (132 mi) northeast and over 1,000 km (621 mi) east. According to a news article, a warning to aircraft was issued for the area around the volcanoes. Video showed gas-and-steam activity, and satellite images detected a daily weak thermal anomaly. On 9 December, the Alert Level was lowered to Green when the eruptions abruptly stopped.[citation needed]
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