Why are the inner four planets composed primarily of rock and metal?
Answer
It was too warm near the protosun for volatile materials like water to condense
The high temperatures close to the central protosun prevented lighter, volatile materials (like water, methane, and ammonia) from solidifying, meaning only materials with very high melting points, like rock and metal, remained available to build the terrestrial planets.
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Formation of the Solar System - The Solar Nebula theory Explained
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