How do trees make rings?

Tree rings are kind of like a tree’s personal diary – they record everything that happens to them - from the weather, to fires and insects. One of our listeners wanted to know how tree rings form, and if you can actually tell the age of a tree by counting the rings. We asked forest ecologist Diana Macias to help us with the answer.  Do you have a stumper of a question for Moment of Um? Send it to us at BrainsOn.org/contact, and we’ll get to the root of the problem. See omnystudio.com/listener for privacy information.