Mari spends time with Dr. Gilbert while he hypothesizes about the Earth's magnetism. Meanwhile, Waka and her brother search Mr. Hayase's lab for signs of Mari.
The Earth is made up of four layers.
La Tierra está conformada
por cuatro capas.
CROSTA - MANTO
NÚCLEO EXTERNO - NÚCLEO INTERNO
A Terra é composta de quatro camadas.