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These Bizarre Blue Tree Rings Are Unveiling Details About Cold Summers From A Century AgoIn order to grow properly, trees need an adequate period of warmth during their growing seasons; otherwise, the cell walls of ...
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Curious blue rings in trees and shrubs reveal cold summers of the past—potentially caused by volcanic eruptionsidentifying these blue rings allows us to spot cold summers in the past. By looking at pine trees and juniper shrubs from northern Norway, scientists identified two extremely cold summers in 1902 ...
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