What is a Sequoia?
Sequoias, or redwood trees, grow in the western United States, mostly in California and Oregon. Sequoias are some of the oldest living things on earth. They are also among the biggest. They often grow more than 30 meters high.
To tell the age of a tree, it is necessary to cut it down. The trunk of the tree has rings. There is a ring for each year of life of the tree. By counting the rings people can learn the age of a tree. One sequoia had 3000 rings! Some sequoias are even older.
Sequoias are ever-green trees, and their bark is very tough. It is about 15 centimeters thick, and it is almost fireproof. The fireproof bark has helped sequoias live through many forest fires.
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