Which planets have a thick atmosphere made of hydrogen and helium? check all that apply. jupiter uranus saturn neptune mars

The planets which have a thick atmosphere made up of hydrogen and helium are Jupiter, Uranus, Neptune and Saturn.

Explanation:

Atmosphere is the layer of gases which surround any planet. Every planet have different compositions of gases in the atmosphere.

Atmosphere of Jupiter contains mainly helium and hydrogen with traces of water, ammonia, methane and other carbon compounds.

Atmosphere of Uranus consists of mainly hydrogen and minor amounts of helium. Minor amounts of methane is also present.

Atmosphere of Saturn consists of thick atmosphere of hydrogen and helium.

Atmosphere of Neptune contains mainly hydrogen and helium with 2-3% of methane gas.

Atmosphere of Mars consists of  thin layer mainly of carbon dioxide. Nitrogen, argon, small traces of oxygen and water vapor are also present.

Hence, the planets having thick atmosphere of hydrogen and helium are Jupiter, Uranus, Neptune and Saturn.

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