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The Inner Planets | Composition, List & Facts - Video & Lesson Transcript | Study.com
Terrestrial Planets: Definition & facts | Space
The Inner and Outer Planets in Our Solar System - Universe Today
What Are The Planets Made Of? - WorldAtlas
Planetary core - Wikipedia
Physics SSG - The four inner four planets — Mercury, Venus, Earth and Mars — are made up mostly of iron and rock. They are known as terrestrial or earthlike planets because