1. TREE RINGS

2. Dendrochronology? It’s all greek to me!

3. Dendrochronology Pronounced den – dro - kron – o - la – gee Word roots
dendro (from dendros, greek for tree)
chrono (from chronos, greek for time or past events)
logy (from logos, greek for reason or word. “ology” indicates a study or theory)

4. What are tree rings? Growth – varies throughout year in our climate
Late Spring/Summer – wide light coloured ring (lots of growth)
Late summer/autumn – narrow darker ring (little growth)
Winter – dormant (no growth)

5. X
From LTTR, Arizona
So one year’s growth is a dark and light ring together = annual growth ring = X

6. Total ring width = a light and dark band
From LTTR, Arizona
Earlywood – appears light in colour – cells are thin walled and large in diameter
Latewood – appears dark in colour – cells have thick walls and are small in diameter
Total ring width = a light and dark band

7. Photos by Grassino-Mayer at UTK (see web address)

8. ? 2002 The new millenium? When were you born?
The year England won the world cup?

9. Put in some important dates

10. Is there a relationship between the width of the summer ring and the weather that year?

11. Let’s do a tree ring activity to find out.