Neptune's Comparison to Earth

Neptune's atmosphere is composed of hydrogen, helium and methane, and

Earth's atmosphere is 78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon

Neptune's water is mostly in the atmosphere. While earth's water is flowing.

Neptune's temperature is very cold because it is the farthest plant from the sun. Earth's temperature is very moderate because it is only the third planet from the sun.