As trees grow, they add a new layer of wood each year, forming growth rings! In spring and early summer, rapid growth produces earlywood—light-colored, less dense wood with larger cells. Later in the season, growth slows, creating latewood, which is darker and denser. The contrast between earlywood and latewood forms a visible ring, typically representing one year of growth. Scientists use these rings to estimate a tree’s age and study past environmental conditions—a field known as dendrochronol
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