The tail of the comet is due to

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(A) When a comet approaches the Sun,the solar heat causes the substances on the comet,such as ice and frozen gases,to vaporize.This process is known a

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Vaporisation of water on the comet

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(A) When a comet approaches the Sun,the solar heat causes the substances on the comet,such as ice and frozen gases,to vaporize.This process is known as sublimation.The radiation pressure and solar wind then push these vaporized particles away from the Sun,creating the characteristic tail of the comet.Therefore,the correct option is $A$.

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