How Old is That Tree?

What You Need:

  • Tree
  • Measuring tape
  • Marker
  • Pen
  • Paper
  • Helper

What You Do:

  1. Help your child find a tree that is at least as tall as a grown up and have your child wrap the measuring tape around the widest part of the trunk. (A grown up might need to help with this part!) The distance around the trunk of a tree is called the circumference. Write this measurement down on a piece of paper.
  2. The measurement of the circumference in inches is also the approximate age of the tree in years!

Did You Know?

Every year a new layer of growth occurs just under the bark. Some trees like firs and redwoods may grow more than this in a year, while others like cedars may grow less. This method is a good rule of thumb to estimate the age of a tree.

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