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Maybe a giant rock hit Earth. This caused giant waves and lots of fires. Dinosaurs drowned and couldn't breathe, so they died. |
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Maybe volcanoes blew up many times. The air was full of poisonous gases. Dinosaurs could not live. |
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Maybe slow changes in the Earth's orbit caused an ice age. |
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Maybe a giant star exploded and the ozone layer was destroyed. This caused cancer in the dinosaurs. |
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Maybe the dinosaurs just got sick and died. |