Scientists can determine the age of a tree by examining its ring's, because a tree grows a new ring every year. It would be useful because not only does a tree grow a ring every year but the rings width will differ. The reason for this, is that a trees ring will be thick if there was alot of water that year and thin if it was very little. Scientists can use this to distinguish a weather pattern in a certain region, also to see how much the weather is changing from how it is today and how it was before. It is an example of absolute dating.
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