The word you're looking for is waning. When the moon's illumination is increasing, it is waxing.
The Klyuchevskaya volcano is in the Kamchatka Peninsula of Russia and the highest active volcano of Eurasia. Its steep, symmetrical cone towers about 60 mi from the Bering Sea.
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Nomadic travelers in central and east Asia were able to survive the harsh conditions of the tundras by adapting to the harsh environment that is engulfing the area or region. Also they keep moving with their hut or shelter and also may uses oxen for transportation and carrying logistics.
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The temperature decreases in the mesosphere since there is no ozone and the amount of air is decreasing.
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