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.
Poden coller as rochas dentro das covas, poden cortalas en rodas e mirar as capas interiores, que son como aneis dunha árbore, e poden recuar na historia e aprender sobre o clima do planeta en tempos moi afastados.