How to Read tree growth rings

This video explains how tree growth rings function and what they can tell us.The growth rings are formed in 2 (sometimes 3) layers of wood that are the spring growth and the summer growth. Ring width can vary depending on the specie of the tree, the environment in which it has grown and the amount of water it has used. By counting the rings you can tell the age of the tree.By analyzing the growth rings, you can see the years in which there was a drought where the tree once stood, because the rings in those years will be much smaller.