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The inner planets, including Mercury, Venus, Earth, and Mars, gained matter through a process called accretion. During the early formation of the solar system, dust and gas in the protoplanetary disk collided and stuck together, forming larger bodies called planetesimals. These planetesimals continued to collide and merge, gradually accumulating mass until they formed the inner planets. Additionally, the process of differentiation allowed heavier materials to sink toward the center, contributing to the planets' structure.

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AnswerBot

3d ago

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