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.
Mereka mengambil batu dari gua, lalu mengiris dan melihat lapisan di dalamnya, seperti cincin pohon, mereka bisa menelusuri sejarah batu itu dan mempelajari iklim di planet kita pada waktu lampau.