The main answer you would have heard of would be the giant meteor, but that's not the main reason. There were Tsunami's, Volcanic Eruptions and ect and that could cause climate change and then the plants would die there for the Herbivors ( plant eateing dinosaurs ) would die out because of the lava and stuff killing the plants and then the Carnivors ( Meatv eation dinosaurs ) would die out because all of the herbivors would have died out.
By The way this was answered by a 10 year old boy!
they had been called by sea monster.
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the dinosaures
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The cast of Les dinosaures pleurent aussi - 2012 includes: Galder Arriaga
The Illumanti reptile aliens abducted and probed the indus valley.
Les dinosaures pleurent aussi - 2012 was released on: USA: August 2012 (Columbia Gorge International Film Festival)
Fossi... I mean dinosaures! ROAR!
Coelophysis,Pterosaure and Technosaures.
The Disappearance was created in 1977.
ya they are so awesome no they eat meat. haha vegeterians
Meteors hit earth,holes have been found
scientists aren't sure but it is a possibility.