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Anonymous
1) When the ground is tilted, the trees grow straight up so they are at an angle compared to the ground
2) The trees grow at different angle depending on whether they grow more to the north or south or at the equador, because the sun takes a different path in the sky. In the same fashion, if there is a hill that blocks the sun in a certain direction, leaves and branches will develop in a more localized fashion, shifting the total weight of the tree and angling the trunk.
3) A large hill or a mountain causes winds that influence the direction in which the trees grow
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