What is your explanation for the extinction of dinosaurs? The extinction of dinosaurs is a mystery that continues to plague scientists. Obviously, there are no dinosaurs in the world today, but people are still fascinated by the subject. No one knows exactly what caused the extinction of the dinosaurs about 65 million years ago. Many scientists have wanted to know the reason why the dinosaurs disappeared, and there are lots of hypothesis about the death of the dinosaurs. Among them, I’d like to introduce the three main causes of the dinosaurs’ extinction: impact of a meteorite, volcanic eruptions, and the Ice Age. 
Some scientists think the dinosaurs were wiped out by the impact of a huge meteorite from space. A meteorite at least 10km across hit the Earth 65 million years ago. The meteorite exploded with the force of thousands of atomic bombs. Then, the explosion sent a cloud of dust up into the air, blocking out the Sun’s light and warmth. Many plants died from lack of sunlight. Plant-eating dinosaurs starved to death, and meat-eaters that fed on them followed.
Others believe that volcanic eruptions were the cause of the extinction of the dinosaurs. In the Late Cretaceous period, there was an enormous amount of volcanic activity. Even a small volcanic eruption could cause a change in a region’s climate. These eruptions threw vast quantities of ash and dust into the air. The ash and dust blocked out the sunlight and caused many plants to die. As a result, the dinosaurs died out. Therefore, some scientists believe that the death of the dinosaurs may have been caused by volcanoes, not a meteorite.
Finally, some scientists think that coming of the Ice Age was the cause of the death of the dinosaurs. In the late Cretaceous period, the Ice Age had already started. So, the temperature slowly dropped all over the world. The dinosaurs couldn’t change their body temperature because they were not a cold-blooded animal, but a homoeothermic animal. Consequently, the dinosaurs couldn’t adopt a change in a region’s climate and became extinct.All in all, after ruling the Earth for more than 150 million years, the dinosaurs mysteriously died out at the end of the Cretaceous period about 65 million years ago. No one exactly knows the reason of the dinosaurs’ extinction. But, many scientists are studying the dinosaurs now, and I think that they will disclose the secret of the dinosaurs’ extinction, someday very soon.
