Scientists Decode the Secret of Unusual Blue Rings in Norway’s Trees
Blue growth rings in woody plant stems indicate years when cells failed to lignify properly due to summers that were too cold ...
Curious 'Blue Rings' in Trees Reveal Fiery Volcanic Secrets
Volcanic eruptions and cold summers leave lasting marks in the wood of northern trees, unlocking the secrets of past climate extremes.
Curious blue rings in trees and shrubs reveal cold summers of the past—potentially caused by volcanic eruptions
Trees need a certain number of warm days in their growing seasons to grow properly; otherwise, the cell walls of new growth ...
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Strange Blue Rings in Trees Reveal History of Volcanic Eruptions
In Norway, scientists have found blue rings in trees that hint at how volcanic eruptions disrupted growth throughout history.