Wood growth rings, X-ray

Wood growth rings, X-ray

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Credit: GUSTOIMAGES/SCIENCE PHOTO LIBRARY

Caption: Wood growth rings, coloured X-ray. Growth rings in wood are exposed by cutting across a tree trunk or large branch. Each ring represents a period of growth in which the tree formed new wood. Each year the outer part of the wood, the living part, lays down a new layer. The older layer dries out and dies, forming the hard mass of wood in the core, the heart wood. Each ring corresponds to a single year and allows the age of the plant to be calculated. A ring varies in width according to the climate that year.

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Keywords: annual growth, biological, biology, botanical, botany, brown, circle, circles, circular, climate change, climatological, climatology, close-up, coloured, concentric, dendrochronology, detail, false color, false colored, false colour, false coloured, false-color, false-colored, false-colour, false-coloured, flora, growth ring, growth rings, nature, plant, radiography, round, still life, still-life, symmetrical, symmetry, wood, x-ray, x-ray machine, xray

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