| http://www.w3.org/ns/prov#value | - File:Solarsys.svg Planetary scientists use the terms gas, ice, and rock to describe the various classes of substances found throughout the Solar System.[12] Rock is used to describe compounds with high melting points that remained solid under almost all conditions in the protoplanetary nebula.[12] Rocky substances typically include silicates and metals such as iron and nickel.[13] They are prevale
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