Question

which statement correctly describes terrestrial planets?
a they are made of mostly rock.
b they are made of gases.
c they are small objects of ice and dust.
d they are very large compared to other planets.

Explanation:

Terrestrial planets (Mercury, Venus, Earth, Mars) are composed mainly of silicate rocks. Gas giants (Jupiter, Saturn, Uranus, Neptune) are made of gases. Comets are small objects of ice and dust. Terrestrial planets are smaller compared to gas giants.

Answer:

A. They are made of mostly rock.