Reasons why the dinosaurs became extinct
Valence - dinosaurs
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Arrange the 9 statements into an order that reflects the likelihood of the statement being the reason for the mass extinction of dinosaurs.
Put the most likely reson at the top
A large asteroid hit the Earth causing dust to clloect in the atmosphere. This cloud of dust blocked out light causing the death of plants and animals
Aliens arrived with a big transport ship and took them to cosmic zoos
65 million years ago was a time of volcanic eruptions. This created acidic dust clouds that made it impossible for animals to breathe and plants to photosynthesise
The ice caps melted casuing sea levels to rise. Plants could not grow and animals had little land to live on
There was a massive increase in the number of meat eating dinosaurs. They preyed on the plant eaters until there were none left.
There was an epidemmic - a disease that wiped out the dinosaur populations
Global warming at that time led to an increse in surface temperature. As dinosaurs were cold blooded they could not cool their bodies
There were changes in the vegetation. Once enormous plants were replaced by smaller varieties. Large plant eaters had no food.
Small mammals evolved and started to eat the eggs of the dinosaurs.