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gas- helium & hydrogen
Neptune is made of hydrogen,helium,molecular and a some ice.
The presence of methane, ammonia, and water vapor in Neptune's atmosphere help create the belts of clouds. These compounds rise from the interior of Neptune due to convection currents caused by heat and pressure in the planet's interior, creating the distinctive cloud patterns seen in the atmosphere.
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Because of the study of seismic waves from earthquakes
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Not elemental oxygen. The interior of Neptune likely contains water ice.
It is true that seismic waves from earthquakes allow us to interpret the structure of Earth's interior.
Neptune and Jupiter have both traditionally called gas giants. However, more recently it has been found that Neptune is actually in a different class of planet called an ice giant, with an interior comprised largely of methane, ammonia, and water.
That could be Uranus or Neptune. Theory suggests they have similar interiors.
No. Neptune does not have a solid surface. So even if we could overcome the temperature problem (which we probably could) there is nothing to build such a structure on.