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There are smallamount of volcanoes. They emit so2 and co2 gases.
Yes, solids transmit sound better than gases because their molecules are closer together.
Solids do conduct heat better than gases, although not necessarily better than liquids. Some solids are actually composite materials, because they can have a porous structure which contains gas within the solid, and this results in solids that do not conduct heat very well. But it is the gas component which has this insulating property.
It is my understanding that, due to their close proximity to the Sun, and the corresponding higher temperatures, lighter gases (mainly hydrogen and helium) evaporated off into space.
Produces fewer green house gases
Oxygen
by reading the values
Liquids are not better than gases; this depends only on the desired applications.
Nitrogen and Oxygen.
dioxide
Nitrogen and Oxygen.
Hoyaaa
Volcanic eruptions
methane,hydrogen,ammonia,nitrogen,carbon monoxide.
Volcanic eruptions
( h2; ch4; nh3)
is it carbon dioxide