The 4 main parts to a coment are
1. Head- Nebulous envelope around the coment
2. Nucleus- <span>Central portion of the head of a comet. Solid part of the comet that has holes filled with ices like water, carbon dioxide (dry ice), and carbon monoxide.
3.</span><span>Coma- A cloud which is the atmosphere of the comet and can extend for millions of miles.
4.</span><span>Tail- Dust Particles that trail behind</span>
Answer:
D, materials combust.
<em>Sorry if its incorrect, I hope this helped.</em>
