What should scientists consider when studying tree rings to understand the variations in the local climate? patterns in their width, their density, and their composition odor from the wood, patterns in their width, and their density their composition, odor from the wood, and patterns in their width their density, composition, and location

The correct answer is - patterns in their width, their density, and their composition.

The tree rings, of the older trees especially, are a natural climate information recorder, as they are having certain patterns that accurately point to the climate patters of each year of their existence.

The width between the rings can tell us if the year was warm and wet, or cold and dry, if the rings are wider than the year was wet and warm, but if the rings are thin than the climate was dry and colder.

The density and composition of the rings shows us the climate patters as well, because they directly depend on it, so warmer climate with bigger precipitation would make the rings less dense, and vice verse, the drier and colder it has been, the  denser the rings. According to that, the composition of the rings may be directed towards certain part, denser or less dense, having bigger dark rings (which are the ones that appear during the growth in the colder period), eaqch of which points to a certain type of climate.

The correct choice is the first. patterns in their width, their density, and their composition