Bristlecone Pines

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Bristlecone Pines Long Living TreesThe Oldest Trees Trees can live for a very The tree that lived to long time. One pine tree in be 5,000 years old was a Utah lived to the age of 5,000 special kind of pine tree. years. That is very old. Just It was a bristlecone pine. think of it! That tree was on Some of the oldest trees in Earth before the first airplane the world are bristlecone took to the sky. It was there pines. These trees are not as before the first car hit the tall as giant redwood trees. road. It was there long before They are not as beautiful as the United States was a redwoods. They are older country!than redwood trees. Some very old bristlecone pines can be found in the White Mountains of California. These trees are more than 4,500 years old. The Age of a Tree How do we know how old a tree is? To know the age of a tree, we have to count its rings. The rings go around the center of the tree trunk. ™ © Advanced Assessment Systems/LinkIt! Passage provided under license from PassageBank.com. Use and duplication is restricted to licensees only. We see them if a tree has Hardy Trees fallen. We can see them if a One reason bristlecone tree is cut down. Every year, pines live a long time is that a tree makes a new round forest fires don’t kill them. ring as it grows. Some rings There is little wood or brush are big. Some rings are small. high on mountaintops. This But each ring equals one means few fires. These pines year. The rings are caused also live a long time because by changes in growth during insects don’t kill them. They the year. In places where the have a hard surface. It keeps seasons are very different, it out insects. Also, it is hard is easier to count the rings. for people to get to these If summer is very hot, and trees. They leave them alone. winter is very cold, the rings They don’t cut them down. show up more. Slow Growing Trees Bristlecone pines grow slowly. Why is that? These pines live high up on mountains. In the winter, it is very cold there. The snow piles up to three feet deep. The winds race through the branches at 200 miles per hour. In this kind of climate, plants grow slowly. ™ © Advanced Assessment Systems/LinkIt! Passage provided under license from PassageBank.com. Use and duplication is restricted to licensees only.

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