65 million years ago, at the end of the Cretacic period, the Earth underwent important changes in its environment. Animal and vegetable life were in danger. Perhaps only one of these changes affected life on Earth or perhaps a combination of several. Something is certain: the dinosaurs became extinct at that time. There are many theories to explain how dinosaurs disappeared.
### _IMPACT CRITER_
In the **1990s**, a meteor crater 180 m (110 miles) wide, on the seabed in the **Yucatan peninsula, Mexico**, was dated to the Cretaceous Period. The rock that formed the **Chicxulub** crater was 10 km (6 miles) wide. The impact could have produced so much dust, it blocked the sunlight and caused mass extinction.
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### DEATH FROM SPACE ?
The earth is continuously bombarded by waste from space, from dust particles to pieces of rock. Most burn when crossing the earth's atmosphere, but some are large enough to survive. The rocks of space that land on the surface of the Earth are called meteorites. **A large meteorite fell in the earth and caused the massive commotion that caused the death of the dinosaurs?**
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### OTHER THEORIES OF THE EXTINCTION OF DINOSAURS
#### DEATH BY VOLCANOES?
Towards the end of the Cretaceous Period there were many volcanic eruptions in what is now the center of India. They went on a large scale and threw a lot of dust into the Earth's atmosphere, where high winds carried it around the planet. Like the theory of the impact of a meteorite, this theory says that atmospheric dust blocked sunlight and caused many years of cold and darkness in the world. without sunlight, the plants did not grow, and without food, the animals died.
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#### DEATH BY GIANT WAVES
If a giant meteor fell into the sea, it could have created a tsunami (a huge wave). If it exploded in the earth, it could have caused a shock sling so huge as to trigger earthquakes and landslides under the sea, which could have unleashed megaolas. These could have reached high speeds inland across the globe and, in a few hours, have covered the lowlands, destroying habitats and disrupting plant life and animal life on Earth.
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#### DEATH BY CLIMATE CHANGE
In addition to throwing dust into the atmosphere, the volcans produce carbon dioxide, a poisonous gas that causes global warming. This theory says that high levels of carbon dioxide caused a climate change: Carbon dioxide prevented the sun's heat from returning to space and the Earth's climate became warmer. The water evaporated and the plants died. The animals, losing their food sources, also died.
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