Post by Deleted on Aug 13, 2018 5:24:41 GMT -5
I've been interested in dinosaurs for most of my life (T-Rex is my personal favourite) and I have a huge collection of dinosaur-related items (everything from fossils to fridge magnets).There are three current theories to explain the extinction of the dinosaurs at the end of the Cretaceous. They are:
1. Climate change
The climate changed as the supercontinent Pangaea broke up. By the end of the Cretaceous, global temperatures were falling and differences between summer and winter temperatures were becoming more pronounced. Plants were also changing to suit new environments. Perhaps dinosaurs couldn't cope with these environmental changes.
2. Increased volcanic activity
At the end of the Cretaceous, several parts of the world, particularly the landmass that would become India, were experiencing vast amounts of volcanic activity.
3. Impact of a comet or asteroid
This is the most dramatic theory and it's supported by several lines of evidence, including the existence of Cretaceous sediments rich in the element Iridium. In 1990, on Mexico's Yucatan Peninsula, came the discovery of a possible impact site.
Which theory do you believe?
1. Climate change
The climate changed as the supercontinent Pangaea broke up. By the end of the Cretaceous, global temperatures were falling and differences between summer and winter temperatures were becoming more pronounced. Plants were also changing to suit new environments. Perhaps dinosaurs couldn't cope with these environmental changes.
2. Increased volcanic activity
At the end of the Cretaceous, several parts of the world, particularly the landmass that would become India, were experiencing vast amounts of volcanic activity.
3. Impact of a comet or asteroid
This is the most dramatic theory and it's supported by several lines of evidence, including the existence of Cretaceous sediments rich in the element Iridium. In 1990, on Mexico's Yucatan Peninsula, came the discovery of a possible impact site.
Which theory do you believe?
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