Of the following, which is most likely to be composed primarily of ice?

Rationale

A comet is most likely to be composed primarily of ice.

Comets are often referred to as "dirty snowballs" because they are composed largely of ice, dust, and rocky materials. When they approach the sun, the heat causes the ice to vaporize, creating a glowing coma and sometimes a tail, a characteristic feature of comets.

A (An asteroid) YOUR ANSWER

Asteroids are primarily composed of rock and metal, with very little ice. They are found mainly in the asteroid belt between Mars and Jupiter and lack the volatile materials that characterize comets. While some asteroids may contain water ice, they do not primarily consist of it as comets do.

B (A red dwarf) YOUR ANSWER

Red dwarfs are a type of star, not a solid body. They are composed of hydrogen and helium gas undergoing fusion in their cores. Stars do not consist of ice; rather, they have extremely high temperatures and pressures, making the presence of ice impossible in their structure.

C (A comet) CORRECT

Comets are composed primarily of ice, along with dust and rocky components. Their icy nuclei, primarily made of water ice, carbon dioxide, ammonia, and other volatile compounds, make them distinct from both asteroids and planets. This icy composition is what gives comets their unique behavior as they approach the sun.

D (The planet Mercury) YOUR ANSWER

Mercury is a terrestrial planet with a rocky surface and no substantial atmosphere, resulting in extreme temperature variations. It lacks the icy composition characteristic of comets, making it highly unlikely to be primarily composed of ice.

Conclusion

Comets stand out as celestial objects mostly composed of ice, in stark contrast to asteroids, which are rocky, red dwarfs, which are gaseous stars, and Mercury, a rocky planet. This icy composition of comets enables them to exhibit unique behaviors as they approach the sun, highlighting their distinct nature in the solar system.

Of the following, which is most likely to be composed primarily of ice?

A comet is most likely to be composed primarily of ice.

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