sentence: Magnets can make some other metals into magnets when they are rubbed together.
sentences_before: A 'magnet' is a very special metal. Also, if the two poles are the same, the two magnets will push away, or 'repel', from each other. This is called 'magnetism'.
sentences_after: Permanent magnets occur naturally in some rocks, particularly lodestone, but are now more commonly manufactured. A magnet's magnetism decreases when it is heated and increases when it is cooled. It has to be heated at around 1000 degrees Celsius.
concept_name: magnet
headings: Magnet
categories: Magnetism Tools