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Extinction

is an element...

Question

is an element which is not naturally found on earth's surface but is found in asteroids, meteors and comets.

A

Gallium

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B

Iridium

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C

Uranium

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Solution

The correct option is B Iridium
Iridium is an element found only in comets, meteorites and asteroids. It is not found naturally on the surface of Earth. Its discovery led scientists to belive that a large asteroid must have hit the Earth which could have been reponsible for a mass extinction.

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