Read the text"and"decide True (T) or False (F).
Do you know something about tree rings? Do you know they can tell us what the weather was like at some point in time, sometimes even hundreds of years ago?
A tree will grow well in a climate with lots of sunshine"and"rainfall."And"little sunshine or rainfall will stop the growth of a tree. We can see the change in the climate by studying the tree’s rings. For example, to find out the weather ten years ago, the rings of a tree from the outside to the inside. If the tenth ring is quite far from the eleventh ring, then you can be sure that it was sunny"and"rainy most of that year, but if it is close to the eleventh ring, then the climate that year was bad.
Tree rings are important not only for studying the history of weather but also for studying the history of man. Many centuries ago, a lot of people lived in a place in New Mexico. But now you can find only"sand"there — no trees, no people. What happened?
A scientist studied the rings of the dead trees there. He found that the people there had to leave because they had cut down all the trees to make fires"and"buildings. As all the trees had gone, the people there had to move.