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It is not certain that climate change killed the dinosaurs. It is likely that several factors combined. Temperatures though rose by around 10°C between the Early and Middle Cretacious Period. This could have been caused by a huge asteroid impact. It could also have been caused by extreme volcanic eruptions in the area of India and Pakistan.

There was great climate change in the Late Cretacious Period. Continental movement and volcanic eruptions made many changes. Sea levels fell and tropical vegetation was replaced by woodlands. If the vegetarian dinosaurs' food supply failed, then the food chain would affect the meat eaters too.

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