In The Croods the girl Eep meets Guy who is travelling to the mountain, because the world is ending.
Here is a scene from the film that shows Guy telling Eep the world is ending.
How does Guy know that the world is ending?
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It is based on Guy's theory that the earthquakes are a symptom of The End (of the world) and that heading to higher ground is the best way to possibly escape from the calamity. He's something of a cave-scientist and this is the kind of thing that cave-scientists do. It also contrasts his out-of-the-box thinking against that of stick-in-the-mud Grug.