Question

A main difference between asteroids and comets is that asteroids are mostly made of rock and comets are mostly made of.

Answer 1

The main difference between asteroids and comets is their composition, as in, what they are made of. Asteroids are made up of metals and rocky material, while comets are made up of ice, dust and rocky material. Both asteroids and comets were formed early in the history of the solar system about 4.5 billion years ago.Explanation:

Answer 2

Step-by-step explanation:

Comets are mostly made of ice and dust