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Analyzing Data Reading a Tree's History The analysis of tree rings can help determine information about a tree and the environment in which it grew. A tree's age can be measured by counting its growth rings—each ring is produced by a year of growth. The specific environmental conditions for each year of growth can be inferred by examining the relative width and color of each ring. Use the photograph at left to answer the questions. 1. Calculate Approximately how old was this tree when it was cut down? MATH 2. Infer Areas A and B were both produced by four years of growth, yet they are different widths. What climatic conditions might account for this difference? 3. Interpret Visuals The area at C is blackened from a fire that apparently affected only one side of the tree. Describe how the tree grew after this fire. Formation of Wood Most of what we call "wood" is actually layers of secondary xylem produced by the vascular cambium. These cells build up year after year, layer on layer. As woody stems grow thicker, the older xylem near the center of the stem no longer conducts water and

          Analyzing Data
Reading a Tree's History
The analysis of tree rings can help determine information about a tree and the environment in which it grew. A tree's age can be measured by counting its growth rings—each ring is produced by a year of growth. The specific environmental conditions for each year of growth can be inferred by examining the relative width and color of each ring. Use the photograph at left to answer the questions.
1. Calculate Approximately how old was this tree when it was cut down? MATH
2. Infer Areas A and B were both produced by four years of growth, yet they are different widths. What climatic conditions might account for this difference?
3. Interpret Visuals The area at C is blackened from a fire that apparently affected only one side of the tree. Describe how the tree grew after this fire.
Formation of Wood Most of what we call "wood" is actually layers of secondary xylem produced by the vascular cambium. These cells build up year after year, layer on layer. As woody stems grow thicker, the older xylem near the center of the stem no longer conducts water and

Analyzing Data
Reading a Tree's History
The analysis of tree rings can help determine information about a tree and the environment in which it grew. A tree's age can be measured by counting its growth rings—each ring is produced by a year of growth. The specific environmental conditions for each year of growth can be inferred by examining the relative width and color of each ring. Use the photograph at left to answer the questions.
1. Calculate Approximately how old was this tree when it was cut down? MATH
2. Infer Areas A and B were both produced by four years of growth, yet they are different widths. What climatic conditions might account for this difference?
3. Interpret Visuals The area at C is blackened from a fire that apparently affected only one side of the tree. Describe how the tree grew after this fire.
Formation of Wood Most of what we call "wood" is actually layers of secondary xylem produced by the vascular cambium. These cells build up year after year, layer on layer. As woody stems grow thicker, the older xylem near the center of the stem no longer conducts water and

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