Comets are made mostly of ice and dust. As comets get close to the sun, they start to "melt" and release what?
- A. Steam and dust
- B. Gas and dust
- C. Steam, gas and dust
- D. None of the above
Explanation
Near the Sun, cometary ices sublimate directly into gas, carrying dust away from the surface. The visible release is therefore gas and dust rather than ordinary steam alone.