How are annual rings formed in trees?

How are annual rings formed in trees?

At the point when trees develop, they accumulate wooden fibres around their heartwood. These fibres are splendid and permeable in spring with the goal that a considerable measure of water can reach the new leaves through them. By harvest time, they end up darker and thicker so the tree ends up steady and impervious to frost in the winter rest period. This procedure shapes a bright ring and a dark ring around the heartwood ever year. On the off chance that you count the dark rings of a horizontal cross section of the tree trunk, you can discover the age of the tree. In the tropics, where there are no particular seasons, the trees don't build up any rings. They grow all round the year and don't have any rest period.

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