They can take rocks within the caves, and they can slice them and look at the layers within with rocks, much like the rings of a tree, and they can count back in history and learn about the climate on our planet at very different times.
洞窟内の岩を採取し 薄切りにして 岩の内部の層を調査します 木の年輪にそっくりで 歴史を遡ることができ 全く異なる時代の 地球の気候が分ります