Question 747958
Each year a tree adds a new ring to its cross section. Some rings are thicker than others. Why would this be?
Trees expand slower in drier years.
------- 
Suppose the average ring was .5 cm thick.
Approximately how old is a tree with a circumference of 700 cm?
age = 700/0.5 = 1400 years
=================
Cheers,
Stan H.