Answer:

What would be the environmental effects if the earth collided with a large comet? For instance, what would the climate be like afterward, and what forms of life would be most likely to survive?

David Morrison of the National Aeronautics and Space Administration's Ames Research Center, replies:

"The effects of an impact on the earth depends critically on the size, and hence the energy, of the impact. For example, a comet less than 100 meters across will explode high in the atmosphere and probably do no harm whatsoever. If the comet is 10 kilometers across or larger (that is, if the impact carries an energy of more than about 100 million megatons), the resulting global environmental damage will be so extensive that it will lead to mass extinction, in which most life forms die. This is what happened 65 million years ago at the end of the Cretaceous era when the dinosaurs went extinct. The environmental consequences of a giant impact take many forms; the worst effects come from a global firestorm ignited by back falling impact debris, and from a global pall of darkness that lasts for many months due to dust suspended in the stratosphere."

Gerrit L. Verschuur, an astrophysicist and radio astronomer at Rhodes College in Memphis, Tenn., has been investigating this topic. He fills in more of the disconcerting details:

"A collision between a comet and the earth would be a calamitous event. Based on the best available computer simulations, the impact of an object a kilometer or more in size would probably trigger the end of civilization. Such a body might not wipe out our species, but if the incoming object were more than about five kilometers across, it is very unlikely that Homo sapiens would survive.

#Hope it helps
sorry this is all I know

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