Terrestrial planets are mostly silicates and iron with possibly a thin veneer of more volatile materials like water oceans (on the Earth) or atmospheres (Venus, Earth, and Mars).
(Terrestrial planets; are mostly; silicates and iron with possibly a thin veneer of more volatile materials like water oceans (on the Earth) or atmospheres)
Terrestrial planets
are mostly
silicates and iron with possibly a thin veneer of more volatile materials like water oceans (on the Earth) or atmospheres