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A transverse section of the trunk of a ...

A transverse section of the trunk of a tree shows concentric rings which are known as growth rings . How are these rings formed ? What are the significance of these rings ?

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i. Age of wood can be calculated
ii. The quality of timber can be ascertained
iii. Radio-Carbon dating can be verified
iv. Past climate and archacological dating can be made.
v. Provides evidence in forensic investigation
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