A Study of Climate Change Contents Background The Life of a Tree Activities Tree Ring Growth and Weather with Teacher Talk. Tree Core Reconstruction with Teacher Talk Vocabulary Tree rings provide a record of local climate during the life of the tree.
Many trees are hundreds of years old, and a few live thousands of years.
Thus the rings provide information that is not available from scientific records. This is the pattern in Alaska. The light layer is early wood , formed when the tree is growing rapidly. The dark layer is late wood and is grown more slowly. The growth occurs at the outside of the trunk, just under the bark, so that a light and dark ring pair represents one year.