What form does carbon dioxide take on Earth?

Carbon dioxide is never naturally a solid or a liquid on Earth. It may be a gas or it may be in solution (in water, as carbonic acid, for example).

It can, however, be frozen artificially, and so can be readily observed as a solid known as 'dry ice'. At normal temperature and pressure, however, it sublimates - changes from solid to gas without the intervening liquid stage. The mist that is generated is actually water droplets condensing from the surrounding air, not the carbon dioxide gas itself.

Carbon dioxide is a gas under normal pressures and temperatures. When it is cooled sufficiently, it becomes a solid. This is dry ice and it is used as a refrigerant often. Because it goes from solid to gas at room temperature and pressure (subliimates) the vapors are often used in films to represent fog or mist.

Carbon dioxide is also produced by internal combustion machines like cars engines and contributes to the "greenhouse" gas that traps heat in the earth's atmosphere, causing a gradual rise in the temperature of the earth, ultimately leading to the melting of icecaps and the rising of sea waters.

I was going to say colourless gas with slightly acidic taste in high concentrations but George Bush is much more accurate

George Bush

a gas, unless you super cool it in which case it will be a solid. CO2 sublimes from solid to gas so it is seldom ever found as a liquid.

When the gas is artificially frozen, it is referred to as " dry ice" & is used for spooky movie fog effects & for making soda pop @ home, amongst other things.

;-)

gas

Sorry jb, but you're not funny.