The professor found an underground sea., true, false, Axel could move normally during the first two days., true , false , There was light under the Earth because of electricity from the rocks., True , false , They travelled across the sea by boat., true , false , Hans threw the pickaxe into the water to check how deep the sea was., true , false , The pickaxe touched the bottom of the sea., true , false , There were marks on the metal head of the pickaxe., true , false , They saw only one strange animal in the sea., true, false .

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