Why Do Trees Have Rings? | Earth Lab

You can tell how old a tree was by the rings in its trunk, but where do they come from? James May is here to answer.

"Subscribe to Earth Lab for more fascinating science videos - http://bit.ly/SubscribeToEarthLab

All the best Earth Lab videos http://bit.ly/EarthLabOriginals
Best of BBC Earth videos http://bit.ly/TheBestOfBBCEarthVideos

Here at BBC Earth Lab we answer all your curious questions about science in the world around you. If there’s a question you have that we haven’t yet answered or an experiment you’d like us to try let us know in the comments on any of our videos and it could be answered by one of our Earth Lab experts.
"

Видео Why Do Trees Have Rings? | Earth Lab канала BBC Earth Lab