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Terrestial planets are similar to earth in composition.heat from the sun evaporated lightweight elements like hydrogen,helium into interplanetary space.mostly rock and metal was left in this zone and clumped together to form the inner rockey planets
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Terrestrial planets are rocky because their composition is similar to the earth's composition.and rock and metal will be more in this zone.these have a hard surface.example:: Mercury, Venus,earth and mars are the terrestrial planets in our solar system. Hope this helps u
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