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What are two pieces of evidence used to support the theory that dinosaurs became extinct as a result of volcanic eruptions about 65 million years ago?
Wiki User
∙ 13y ago
The element iridium is fairly rare on the Earth, but seems to be somewhat more common in meteorites and in asteroids. Microscopic diamonds can be formed under extremely high temperatures and pressures, such as those that would be caused by a high-speed impact.
There is a layer of iridium dust and micro-diamonds around the world that seems to be about 65 million years old. Below that level, there are fossils of many very large dinosaur species; above that level, there wasn't much left alive. Luis Alvarez came up with the idea - widely ridiculed at the time - that the impact of an asteroid or comet may have killed off most large animals at about that time.
How large was the asteroid or comet? We can't be certain, but probably about 10 miles long.
Wiki User
∙ 9y ago
Wiki User
∙ 13y ago1. There is an iridium layer that is 65.5 million years old and coincides with the extinction of the dinosaurs. Iridium is rare on Earth's surface, but is common in asteroids. However, it would have taken an immense asteroid to deliver enough iridium to Earth that it would be common in a layer that covered the entire world.
2. Satellite imaging revealed a round crater at the coast of the Yucatan Peninsula. The crater was 112 miles across.
3. There is evidence of a megatsunami that would have been caused by the impact, because the asteroid crashed in the ocean. This evidence is 65.5 million year old marine sediments that were dragged far inland by the megastunami. Also, terrestrial rocks and debris that were carried out by the tsunami have been found far into what was then the sea.
Wiki User
∙ 13y agoActually, the theory that is now commonly accepted is that the extinction occured as a result of an asteroid impact.
Wiki User
∙ 14y agothe flood did. all dinosaurs are, are reptiles that dont stop growing, like snakes and lizards
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Why are dinosaurs endangered?
dinosaurs are extinct not endangered
Why doesn't Ireland have volcanoes?
Ireland has volcanoes. However there are no active ones. They are all extinct. There is lots of evidence of volcanic activity, most notably the Giants Causeway. It was created by volcanic activity millions of years ago.
Did dinosaurs become extinct AD or BC?
B.CAnswer:Although the majority of dinosaurs died out about 70 million years ago, the present day birds are evolved from theropods and are direct descendants of the dinosaurs. In that manner dinosaurs have not become extinct.
Is the dinosaurs ALL wiped out when the large meteorite hit the earth?
According to modern scientific theory, all the remaining dinosaurs went extinct during or shortly after the asteroid hit the Earth 65 million years ago.No evidence of a large meteorite hitting the Earth.
When did dinosaur's go extinct?
Dinosaurs became extinct 65 million years ago, at the end of the Cretaceous period.
What are two pieces of evidence used two support the theory that dinosaurs became extinct as a result of volcanic eruptions about 65 million years ago?
Using fossils and geographical clues, paleontologists have determined with some certainty that a meteor, not a volcano killed the dinosaurs. Although dinosaurs died out, some birds survived and today's birds are the direct descendants of the dinosaurs.
What are two pieces of evidence used to support the theory that dinosaurs became extinct as a result of volcanic eruption about 65 years ago?
The dinosaurs died by a giant asteroid that hit Mexico.
How did dinosaurs go extinct(theory)?
It is a rock called an asteroid, or comet, or a volcanic eruption.
How many dinosaurs are there approx?
Technically Dinosaurs are extinct but there may be some evidence that a lizard might be a dinosaur.
How did the triceatops get extinct?
It is not known for sure how the dinosaurs became extinct. A extreme volcanic eruption, and ice age and many other theories exist, but have not been proven.
What evidence states dinosaurs became extinct from a volcanic eruption?
None. The extinction of the dinosaurs was created by a meteor crashing into Earth. The initial impact was in the nowaday's Gulf of Mexico and did evough damage. On top of that, the debris blocked out the sun and created a severe climate change. Hypercanes were huge storms that needed that heat to be created. All of this killed of the dinosaurs.
Why does Scotland not get volcanic eruptions?
There are no active volcanoes in Scotland, only extinct ones which do not erupt. However, according to recent scientific research, there is evidence of lightweight UK earthquakes and the re-activation of dormant pre-historic volcanoes. So, we might even expect some 'Vesuvius' type volcanic activity in the future.
A sentence with word extinct?
Dinosaurs are now extinct. There are many species of birds that are extinct.
Are carnivorous dinosaurs instinct?
Extinct. Yes, ALL dinosaurs are extinct.
What is a description of the stages of volcanic eruptions?
active is when the volcano is going to or is erupting. dormant is when the volcano is not erupted but is sleeping. extinct means that the volcano is dead and it will never erupt again.
Are dinosaurs extinct land reptiles?
Current research suggests dinosaurs are more closely related to birds than land reptiles. There is fossil evidence of dinosaurs with feathers, and it has even been speculated that dinosaurs are warm blooded, unlike reptiles.
What dinosaurs do they have?
Nobody has dinosaurs; they're extinct.
