Respuesta :
Gas giants: atmosphere of mainly hydrogen and helium, mantle of metallic hydrogen
KE giants: atmosphere of mainly hydrogen helium, and methane , mantle of water. ammonia, and methane ice, have a core made of rock or solid
both: have rings
Since helium cannot be produced chemically, our supplies come from the extremely slow radioactive alpha decay that takes place in rocks. Helium can be extracted from rocks and natural gas deposits, but it is around 10,000 times more expensive to do so from the air. It may be found in water, soil, and air and provides plants and animals with the essential nitrogen they require. The natural decomposition of manure and dead plants and animals produces the majority of the ammonia that enters the environment. Fertilizer uses account for 80% of total ammonia production.
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