When you blow up a balloon the skin is something like 0.1mm thick, and the balloon is around 250mm across. Or a ratio of 1/2500. Our planet's crust is only 5km thick on the ocean floor, and the planet is about 13,000km - or a ratio of 1/2500. Under that thin skin our planet is mostly liquid. We live on a giant water balloon!
Scientists think the moon was formed when another giant water balloon hit this one, and there was a very big splash. It could happen again.
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