When these terrestrial planets formed, denser materials stayed near the surface. Within the solar system, a differentiation pattern occurred. The inner terrestrial planets are rocky and metallic, and outer gas giant planets are gaseous and composed mainly of hydrogen and helium.
When these terrestrial planets formed, ________ materials stayed near the surface. Within the solar system, a ________ pattern occurred. The inner terrestrial planets are __________ , and outer gas giant planets are
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