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It varies depending on the story, but nearly always it either "just happens" (it's a natural disaster, sort of like an earthquake or a volcanic eruption but much more powerful) or it's a result of something the Kryptonians themselves are doing (this version became really common in the late 1960s, usually as an ecological cautionary tale).

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11y ago

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Where is Supermans birthplace?

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What planet was Superman born on?

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