Hydrogen sulfide (H2S) is the mostly deadly gas.
deadly gas
Nptune is made mostly out of gas
Mostly gas
Uranus is a gas giant, it has a rocky core but is mostly gas.
To make deadly Nuclear bomb
Neptune is mostly made of gas. Also, Neptune has rings and clouds. BY: jill the queen of awesome
Uranus is a gas giant, it has a rocky core but is mostly gas.
the gas bombs
How you spell it: F.L.U.O.R.I.N.E. is a deadly gas.
Which gas is air mostly made up from
it is made up of mostly gas
no it's soothing in your nostrails if it was your own