Pacific Gas and Electric Safe Tree: The right tree in the right place.
HomeLinksGlossaryTeacher's GuideAbout the SafeTree Program

Trees and Powerlines
Trees Are Awesome
Electricity Can Hurt
Electricity Basics
Safe Tree Safety Tips
Find the Hidden Dangers
Student Certificate

 

 

 

 

 

 Tree Time

Most trees can live 100 to 200 years, and some, like the giant redwoods and bristlecone pines, can live thousands of years.

As trees age, they grow taller and wider. Each year, trees form new cells, which are arranged in rings around the tree's center. So when you look at a cross-section of a tree, the rings you see will show you the amount of wood produced during one year. The study of tree rings is called dendochronology.

Trees produce different amounts of wood in response to temperature, rainfall, and other conditions. Lots of rain increases tree growth, producing wider rings. Not enough rain or crowding from nearby trees both cause slower growth with narrow rings.

Trees

Would you like to try an activity about tree rings?

 

  Next: Safe Tree Trimming  

  Previous: Tree Products  

 

Brought to you by RhodeIslandTreeCare.net