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Why are trees brown?

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It really depends on which type of tree you are asking about because not all trees have brown bark.

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First answer by Natural Val. Last edit by Natural Val. Contributor trust: 875 [recommend contributor]. Question popularity: 18 [recommend question]

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Why are the trees brown?  Why the trees are brown?  Why are most trees brown?  Why are some trees brown?  Why are trees trunks brown?  Why are your trees turning brown?  Why is the trees brown and green?  Why do trees always have brown trunks?