Question 41

Comets are composed mainly of ice, rock, and dust.

Comets primarily consist of ice, rock, and dust, which form their nucleus. This composition distinguishes them from other celestial bodies, such as asteroids, which are largely made of metal and rock.

A) metals

Metals are not a significant component of comets. While some trace amounts may be present, the primary materials that constitute comets are ice, rock, and dust, making this option incorrect.

B) ice, rock, and dust

This option accurately reflects the main composition of comets. The nucleus of a comet is made up of a mixture of volatile substances (primarily ice) and solid materials (rock and dust), which is essential for the formation of the comet's tail when it approaches the sun.

C) igneous rock

Igneous rock is formed from the solidification of molten magma or lava, and it is not the main component of comets. Comets are not primarily made of igneous rock, making this option incorrect.

D) volcanic dust

Volcanic dust refers specifically to particles released during volcanic eruptions and does not represent the composition of comets. Comets are not made up of volcanic dust, which renders this option incorrect.

Conclusion

The correct answer, ice, rock, and dust, precisely describes the composition of comets, highlighting their unique nature in the solar system. Other options fail to capture the essential elements that define comets, thus confirming that they are indeed primarily composed of ice, rock, and dust.