Growth rings on a tree from Tunguska

Growth rings on a tree from Tunguska

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This image is part of the feature Tunguska 100th


Caption: Growth rings on a larch tree after the Tunguska impact. The increased diameter of each successive ring shows the growth of the tree in a year. This cut supports the hypothesis that growth increased after the Tunguska explosion. In 1908 a large astronomical body exploded above Tunguska, Siberia, Russia. The energy released was equivalent to around 1000 times that of the Hiroshima atomic-bomb. 60 million trees were destroyed by the explosion, and accelerated growth in those remaining is probably due to less competition for light and fertilisation from the ash of the destroyed trees.

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Keywords: 1900s, 20th century, biological, biology, black-and-white, botanical, botany, comet, growth ring, impact, larch, meteorite, monochrome, nature, novosti, rings, russia, tree, trunk, tunguska

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