Humidity in the air.
it will rust
Car magnets doesn't cause rust.
When your car stalls when its raining, it may be getting water in the distributor cap. Make sure the cap is on properly.
NO! That is extremely dangerous and you could get electricuted! Just go find a place to stay until it stops raining, or stay in your car, and jump start it when it stopped raining.
car radiators used to be made of copper, copper doesnt rust. most radiators are now made from aluminum.aluminum also does no rust
rust can dissolve the metal on ur car then ur car can fall apart and it will wreck your paint
Its fine
When I am in my car and it is raining I might hydroplane.
If you are new to the concept of car rust, http://www.dummies.com/how-to/content/how-to-protect-your-car-from-rust.html is a great article on a beginner's guide to it.
The best way to remove rust from a chrome with bodywork is to take your car to an autobody shop. They are the best people that can remove rust from chrome.
When salt and water and air combine, it accelerates the oxidation, therefore making the car rust faster :)
The temperature inside the car is higher than outside