Mercury is the smallest of the terrestrial planets.
The others in order after Mercury:
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The terrestrial planets, from largest to smallest, are Mercury, Venus, Earth, and Mars.
Mercury, Mars, Venus, Earth
The four smallest planets in our solar system, Mercury, Venus, Earth, and Mars, are located closest to the sun. They are considered the inner or terrestrial planets.
The largest of the terrestrial planets in the solar system is Earth.
Earth is the largest terrestrial planet in our solar system.