What Make the Ring on a Tree?


If you cut down any tree that is more than one year old and look at the cross-section, you will see alternating bands of light and dark wood. The amount of wood formed by the tree during a single growing season or year.

Why are the bands lighter and darker? This is because the wood grows in a different why during the different season. In spring and early summer , the cells of the wood are bigger and have thinner walls. This makes a darker band.


The age of a tree can be told by counting the annual rings. When you look at the rings of the tree, you will notice that they vary in width and in many other detail. These are variations are caused by the weather conditions that prevailed during the given season. A difference in the light, the amount of rain, and the mineral in the soil, will produce will different in the rings of a tree. That is why scientist often use the ring to obtain a clue to the weather conditions that prevailed years ago in certain part of the world.

 When a tree grows, the wood of the tree is not the only thing that increases in size from year to year. Addition are also made to the bark of the tree. This is done by means of thin band of living, dividing cells betweent the wood and  the bark. This layer is called ‘’ the cambium ‘’ . the new cells which are formed on the wood side of the cambium becomes wood. The cells formed towards the outside become bark.


The outer portion of a woody stem or root is called ‘’bark’’ . Sometimes it is hard to tell now much of the stem should be called bark  And wood.

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