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OCR: STRUCTURe Crust: 25 to 160 km thick Mantle 956 km thick Core 2750 3100 km radius Composition Researchers believe that Venus, which is almost perfectly spherical, has liquid iron core smaller than the Earth S This would be surr rounded by mantle composed of silicates. However, it is possible that Venus does not have discrete core In this case the iron and silicates would be mixed throughout the planet instead Q being separated into mantle anc core The crust ranges from 25 km thick in the lowlands to 160 km thick in the highlands. This relatively thick static crust may be composed of a single plate Soil samples taken by Veneras and 10 indicate that Venus crust has composition similar to terrestrial ocean deposits surrounded plane separ ated crusi simila