Yes a ground wire can cause a spark and cause fire
The ground wire leads from the negative side of the battery and connects either to the engine block or to the frame of the automobile.
This must be a prank question because the service panel ground wire is a bare wire. There is nothing to catch fire as there is no insulation covering the wire. If not a prank question please give more detail as to what is happening.
If the exposed wire grounds out and a great amount of heat is produced then yes a fire could start under this condition. Remember overhead transmission wires are exposed wires but are well insulated from ground so as not to have the above scenario happen.
Most all vehicles these days are negative ground so, if you touch a positive wire/terminal or cable to ground you can cause damage and possibly start a fire.
To prevent electrical charges generated by lighting from entering the home which can cause fire and damage components.
ground
yes
A corroded ground wire will cause a fuse to blow. Until the ground wire is cleaned the problem will persist.
You don't say "turn off" or turn on". Light should be connected black to black and white to white and ground to ground. If you connect white to ground it will work, but you are then using the ground wire for an unintended purpose. Neutral is bonded to Ground at the panel. Current on ground wire could cause ground loops and may cause GFCI to trip if you have them in your house.
Your entire automobile electrical system is grounded to the frame of the vehicle. A loose or corroded ground wire can cause the dash lights to Flickr and the car to stall out.
replace the ground wire cause its probably corroded
Could have a short in your wire, a bare wire touching bare metal could cause it to ground out.