The gas giants have no volcanoes; they are composed entirely or almost entirely of gas, so there is nothing to erupt. However, it should be noted that some of the satellites of the gas giants do have volcanoes.
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which of the gas giants are made of frozen gas
Yes, Neptune does not have any volcanoes on its surface. It is a gas giant composed mainly of hydrogen, helium, and some methane. The extreme temperatures and pressure on Neptune would prevent the formation of traditional volcanoes as seen on rocky planets like Earth.
Gas is what gives volcanoes most of their power. One of the reasons this happens is because the gas keeps expanding.
Mercury has volcanoes and craters like the moon, but no rings, only the gas giants have rings, and Mercury has no moon.
No. Gas giants do not have a solid surface on which lava might flow.