End Cretaceous Mass Extinction

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End Cretaceous Mass Extinction
"By The end of the Mesozoic Era one massive extinction occurred known as The Cretaceous Mass Extinction.This Extinction was assumed to have been caused as result of two mechanism recognized as the impact and the flood volcanism hypothesis".
The impact hypothesis which is the asteroid discovered by the physicist luiz Alvarez played a role in causing the cretaceous mass extinction It was supported through evidence these facts are: Alvarez discovered unusually high levels of iridium a rare metal at the earth surface.
Iridium occurs at impact sites .
Alvarez conclusion of that the extinction was caused by a ten kilometer asteroid. the existence of an asteroid burned
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