Q:

When did dinosaurs become extinct?

A:

Quick Answer

Dinosaurs became extinct about 65 million years ago. This extinction event occurred between the Cretaceous and Tertiary periods and wiped out about 50 percent of all other organisms then living on the planet.

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When did dinosaurs become extinct?
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Full Answer

Because the dinosaurs died out in a relatively short period of time, scientists surmise that some sort of global disaster had caused this massive extinction event. Some extinction theories include an increase in volcanism, a change in the climate, the movement of continents and the consumption of dinosaur eggs by evolving mammalian species.

In the 1980s, Luis Alvarez proposed one of the most probable theories for the extinction. He believed that an extraterrestrial object such as an asteroid or meteorite crashed on Earth, throwing up debris into the atmosphere. This debris effectively blocked out much of the sun's light, causing plants to die worldwide, which led to the extinction of many species unable to cope with this climate change.

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Related Questions

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    When did the velociraptor become extinct?

    A:

    The velociraptor became extinct at the end of the Cretaceous Period due to an asteroid strike at the Yucatan Peninsula that occurred roughly 65 million years ago. This extinction event, known as the K-T boundary, also killed all other known species of non-avian dinosaurs.

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    How did the pterodactyl become extinct?

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    Scientists do not know exactly why the pterodactyls died out approximately 65 million years ago. Some scientists believe that they died as a result of a meteor impact, while others believe climate change was to blame. Some scientists believe that volcanic gases were the leading cause, according to ABC Science.

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    Why did the dinosaurs become extinct?

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    There is not sufficient proof as to why dinosaurs went extinct, but experts believe it is related to geological events, diseases, climate change and lack of plant life for sustenance. The last known dinosaurs, according to their fossils, existed about 65 million years ago.

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    Why are dinosaurs extinct?

    A:

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