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Trees are tall plants made of wood.
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Plants that aren't quite tall enough to be considered trees are often called shrubs.
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Trees can live for thousands of years.
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Some trees can grow to around 100 metres (328 feet) in height!
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The tallest species of trees in the world include the Coast Redwood, Giant Sequoia, Coast Douglas Fir, Sitka Spruce and Australian Mountain Ash.
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The Giant Sequoia is not only tall, it is also wide. Because of its amazing size, some believe that the Giant Sequoia is the largest living organism in the world!
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Trees produce oxygen and reduce the amount of carbon dioxide in the atmosphere.
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The roots of a tree usually grow underground, helping keep it stable and providing it with water and important nutrients.
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Water and nutrients travel up the tree trunk, through the branches and all the way out to the leaves.
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The trunk of a tree is protected by an outside layer of bark.
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The way a tree grows through different seasons can be seen by growth rings in the wood, they can even be used to determine the age of a tree.
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Planting trees can help prevent erosion.
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Wood from trees can be used in a number of different ways including as a building material and energy source (such as a campfire).