When are magnets attracted and when are they repelled?

when South and North poles are placed together they attract as they are opposite poles. In magnets opposite poles are attracted and like poles are repelled.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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