Sorry if me explanation confuse you. Me try to simplify, but maybe me oversimplify too much.

Mountain no have big hole. It still solid, but atoms and their parts, like electrons, can sometimes go through it, like magic. It not because there hole in mountain, but because of something called quantum mechanics, which is a very weird and complicated way that tiny particles behave.

In normal life, we used to seeing things as either solid or not solid, but in quantum mechanics, tiny particles like electrons don't always behave like that. They can sometimes act like waves, and waves can sometimes pass through things that you might not expect.

So, even though it seems impossible for a solid object like a mountain to have a hole for an atom to pass through, quantum mechanics allows for the possibility that the atom's wave-like behavior can sometimes make it "tunnel" through the barrier, like the mountain, even though it seems solid.
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