| Dating Tree Records |
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| q | In regions of marked seasonal |
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| variations of climate, trees |
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| produce annual layers call |
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| tree rings. |
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| q | These rings are alternations |
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| between layers of lighter, |
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| thicker wood tissue formed |
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| by rapid growth in spring and |
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| much thinner, darker layers |
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| marking cessation of growth |
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| in autumn and winter. |
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