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What causes the rings in trees to form?

Answer

Under the bark of a tree is a layer called the cambium, which is the only living part of the trunk. This layer grows, adding new wood to the tree. A different kind of wood grows during the summer than in the fall. In the summer, the wood grows fast.
Q&A Related to "What causes the rings in trees to form?"
Each year, a tree trunk grows in circumference when the cambium adds a new layer of wood between the old wood and the bark. This new growth forms a new ring. When rainfall is frequent
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The cause of tree rings is differential growth. In the spring, growth is fast and consequently the woody growth is less dense and contains less tanin. Later in the growing season,
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Rings form as old, existing cells become smaller in the cold weather while new, larger cells
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