By weight, Earth contains the most metal when compared between the four terrestrial planets of Mercury, Venus, Earth and Mars. The planet Mercury is composed of nearly 70 percent metal, making it the most metal dense.
Earth is the largest, densest, most massive and gravitational terrestrial planet in the solar system. Mercury is the smallest of all planets in the solar system, being only 5 percent as massive as the Earth, and Jupiter is the largest. Venus is the most similar in density and mass to Earth. Earth's mantle and crust contain metals that have been readily mined and utilized by the human race for centuries. It also has a heavy metal core.