Dating tree cores schengen dating sites
Uranium 235 decay to lead has a half-life of 713 million years, so it is well suited to dating the universe.
Because some of the trees are over 500 years old, there are many things to learn!
Together, the band of light- and dark-colored wood makes up one "annual ring," or one year's growth.
Check out any cut spruce tree stump and you can see the annual rings.growth rate.
Coring a tree entails twisting the borer (which is like a cross between a drill and a screw) into a tree.
The tip of the borer is hollow, so as we twist the borer in, it screws in around a pencil-sized section of tree.