Question

Did you know that a “Terrestrial Planet” is a planet primarily made of silicate rocks or metals, in other words, it has a solid surface like Earth?

Answer 1

The inner planets (Mercury, Venus, Earth, and Mars) are relatively small rocky planets made up mostly of silicate minerals and iron and nickel metal. Most of the earth is made up of only three elements: iron, silicon, and oxygen. Most of the iron is in the core of the earth.