Here's why:
* Cambium: This is a layer of actively dividing cells just beneath the bark of trees.
* Annual Growth Rings: The cambium produces new xylem cells (wood) each year. These cells differ in size and density depending on the season. During periods of rapid growth (spring and early summer), larger, thinner-walled cells are produced. During slower growth periods (late summer and fall), smaller, thicker-walled cells are produced. This creates a visible distinction in the wood, forming a ring.
* Counting the Rings: By counting the annual growth rings, you can determine the age of a tree.
Important Note: This method is most accurate for trees in temperate climates, where there are distinct seasons. In tropical climates where there are no distinct seasons, it might be harder to count rings.
